LCM Alert Validation

Confidence

Failure Category

No Fault Found

Subcategory

No Fault Found

Sensor Verdict: The LCM system generated an alert on the RED (Brake) circuit for trailer SV2600639 at site DET3. Based on the available evidence, this is rated as Inconclusive with a confidence of 42. The technician verbally reported all circuits operational and claimed Phillips app verification, but no supporting documentation — screenshots, photos, or confirmed PCT app output — was submitted to substantiate the no-fault conclusion. The absence of evidence does not confirm the sensor was wrong; it simply means the alert cannot be responsibly cleared or validated.

Photo Evidence: No photos were provided with this work order. Per the LCM troubleshooting procedure, the vendor was required to submit photos of each light illuminated (across all circuits), a clear photo of the nosebox wiring, and a TechAssist app screenshot showing green 'Verified' status beside each of the five circuits. None of these deliverables were fulfilled. Without this visual documentation, there is no way to independently assess the condition of the Brake circuit lights, connectors, or nosebox at the time of inspection. This is a significant documentation gap and represents non-compliance with the required procedure.

Vendor Compliance: The vendor (TA) did not follow the LCM troubleshooting procedure as instructed. While the technician stated they used the Phillips app and tightened connections in the nosebox, no TechAssist app completion screenshot was provided, no individual light photos were submitted, and no specific defect category from the required feedback list was formally selected. The note 'VERIFIED ON PHILLIPS APP' is a verbal claim only. The procedure explicitly requires a screenshot showing green 'Verified' status for all five circuits — this was not delivered. Tightening connections in the nosebox is a noteworthy action and could indicate a marginal intermittent fault existed, but without documentation, it cannot be evaluated further. Compliance is rated as poor.

Repair Summary: No lighting repairs were made. The line items on this work order are entirely unrelated to the faulted RED (Brake) circuit — they consist of a tire pressure sensor activation, standard service labor (0.1 hr), a shop supply/environmental fee, and lot service hourly labor (0.5 hr). No lighting parts, connectors, or wiring components were replaced. The alerting circuit (RED/Brake) was not repaired, and the work order does not reflect any corrective action tied to the LCM alert. The only potentially relevant action was the technician's mention of tightening connections in the nosebox, which is undocumented as a formal repair line item.

Key Concerns: There are several concerns with this work order. First, the complete absence of photos and TechAssist app screenshots is a direct violation of the LCM troubleshooting procedure and makes independent verification impossible. Second, the line items do not align with a lighting inspection — the presence of a tire pressure sensor activation as the primary charge raises questions about whether the technician was primarily dispatched for or focused on a different issue. Third, the mention of tightening nosebox connections, while minor, suggests there may have been a marginal condition present that was not formally documented or categorized. Fourth, the 'no defect found' outcome cannot be confirmed via PCT per the required procedure, which is the less favorable subcategory. Fleet reviewers should consider requiring a return inspection with full documentation compliance before formally closing this LCM alert.