LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

Lighting - Failed Light

Sensor Verdict: The LCM flagged the BROWN (Marker) circuit on trailer V507676, indicating a potential lighting fault. The sensor result is classified as Inconclusive with a confidence of 35%. The vendor's claim of 'no issue found' is plausible given that intermittent faults are a known LCM trigger, but the absence of PCT app verification and compliant photographic documentation means the alert cannot be properly resolved or dismissed. The post-tightening of nosebox terminals does suggest some marginal connection quality may have existed, which could be consistent with an intermittent LCM trigger.

Photo Evidence: All seven attached photos are entirely unrelated to the BROWN marker circuit or any lighting defect. The images document: a corroded 7-way electrical socket (TC_02216), leaking gladhands with visible air bubbles (TC_02215 and TC_02214), a brake chamber/wheel-end assembly (TC_02220), a nosebox area showing the Phillips Connect LCM unit and gladhands but not in a lighting-diagnostic context (TC_02219), an LF slack adjuster missing a clevis pin with stroke exceeding 2 inches (TC_02217), and a rear exterior trailer view (TC_02218). No photos of illuminated marker lamps, no photos of the marker light circuit wiring, and no TechAssist app completion screenshot showing green 'Verified' status on any circuit were provided. The nosebox photo (TC_02219) shows the Phillips Connect unit but is not taken in a diagnostic context and does not substitute for a proper nosebox wiring inspection photo per LCM protocol.

Vendor Compliance: The vendor did not comply with the LCM troubleshooting procedure. The procedure explicitly requires use of the Phillips Connect TechAssist (PCT) app to verify all five circuits, photographs of each light illuminated, a clear nosebox wiring photo, and a TechAssist completion screenshot showing green 'Verified' status beside each circuit. None of these requirements were met. The technician's notes are also poorly formatted and lack specificity regarding which marker lights were inspected, what their condition was, or what specific readings or observations were made. The only action taken — tightening posts in the Smart 7 box — is undocumented with any before/after evidence and does not meet the minimum documentation standard for LCM work orders.

Repair Summary: No formal repairs were recorded and no parts were billed. The only corrective action noted was tightening terminal posts inside the nosebox (Smart 7 box), which the technician suggested may have resolved an intermittent connection issue. This action was not supported by any line items, torque specs, or photographic evidence. The alerting BROWN marker circuit was not confirmed as repaired because no PCT verification was completed. There is no evidence of wiring replacement, lamp replacement, or connector servicing specific to the marker circuit.

Key Concerns: Multiple significant concerns exist with this work order. First, the vendor submitted seven defect photos that are entirely unrelated to the LCM lighting complaint — these appear to be documentation for separate mechanical defects (gladhand leaks, slack adjuster, 7-way socket corrosion) rather than evidence of lighting system diagnosis. This strongly suggests the technician may have conflated multiple inspection findings or submitted photos from a different inspection task. Second, no PCT app was used, which is a direct non-compliance with the stated troubleshooting procedure. Third, the intermittent diagnosis is not substantiated by any data or app output. Fourth, the presence of a corroded 7-way socket (TC_02216) and general corrosion visible throughout the nosebox area raises the question of whether corrosion in the wiring or connector could be contributing to the intermittent LCM alert — this possibility was not investigated or ruled out. This work order should be flagged for vendor non-compliance and potentially reopened for proper PCT-confirmed diagnosis.