LCM Alert Validation

Confidence

Failure Category

Lighting

Subcategory

Lighting - Failed Light

Sensor Verdict: The LCM sensor flagged a fault on the RED (Brake) circuit of trailer V564320 at site DTW9. The evidence supports a 'Defect Detected' outcome with approximately 82% confidence. The technician explicitly confirmed that a Grote light was failed, which is consistent with a brake circuit fault detectable by the LCM system. The additional finding of three loose nuts inside the Smart 7 nosebox may have contributed to intermittent or degraded circuit performance, further validating the sensor alert. Confidence is not rated higher because the vendor did not use the PCT TechAssist app to formally verify circuit health before and after the repair, leaving some ambiguity about whether the root cause was fully isolated.

Photo Evidence: No photos were provided or referenced in this work order submission. The LCM troubleshooting procedure explicitly requires photos of each light illuminated, a clear nosebox wiring photo, and a TechAssist app screenshot showing a green 'Verified' status beside each of the five circuits. None of these were delivered. The complete absence of photographic documentation is a significant compliance gap and prevents independent visual confirmation of the defect, the repair quality, or the post-repair system state.

Vendor Compliance: The vendor (TA) did not follow the LCM troubleshooting procedure as instructed. There is no indication the PCT TechAssist app was used at any point during diagnosis or post-repair verification. No illuminated light photos were submitted, no nosebox photo was provided, and no TechAssist completion screenshot was included. While the technician did perform a physical inspection of lights, circuits, and pigtails — and reported findings in a defined failure category (light failure) — the procedural requirements for this LCM-generated work order were not met. The unit was flipped to 'Active and Healthy' during verification, but this appears to have been done administratively rather than based on documented PCT confirmation.

Repair Summary: The technician removed and replaced a failed Grote light, which maps to the RED (Brake) circuit faulted by the LCM sensor. Additionally, approximately three loose nuts inside the Smart 7 nosebox were tightened, which is a secondary but relevant finding that could impact overall circuit integrity across multiple channels. The line items reflect an R&R for one marker/clearance lamp, which is categorized under mid-trailer side turn indicator and clearance lamp — this is slightly mismatched to the faulted RED (Brake) circuit but may reflect how the Grote combo lamp is billed. A speed sensor activation line item also appears on this WO, which is unrelated to the lighting circuit fault and may represent a separate service performed opportunistically or a billing error.

Key Concerns: Several concerns warrant attention. First, the line item includes a 'Sensor - speed / PCT Sensor Activation' charge, which is entirely unrelated to a brake lighting fault and may indicate either an unapproved service bundled into this WO or a billing inaccuracy that should be reviewed. Second, the lamp assembly line item is categorized as a mid-trailer clearance/marker lamp rather than a rear brake lamp, which creates a mismatch with the faulted RED circuit — the Grote lamp referenced in the notes should be confirmed as a rear-facing brake lamp, not a side marker. Third, full PCT TechAssist compliance was not achieved, and no photos were submitted, which limits auditability and undermines confidence in the repair verification. These items should be reviewed with the vendor before the WO is closed without qualification.