As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) EMERGENCY LIGHT OPS TEST FAILED DURING WEEKLY TEST. "EPSU EXT LOAD AFT LT" APPEARED ON PTP. FAULT OF THE EPSU BRINGS THE TECH TO MULTIPLE POSSIBLE CAUSES. THE CAUSE THAT CONCERNS US IN THIS PARTICULAR CASE IS: CONNECTOR 2872VC WAS CONTAMINATED. DEFECT WAS RECTIFIED BY CLEANING RT DOOR CONNECTOR 2872VC.