As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: DURING HEAVY CHECK BITE TEST RECIEVED 10WL EPSU FAULT. AIRCRAFT WAS SCHEDULED FOR MX. CORRECTIVE ACTION: REMOVED ADN REPLACED PER AMM 33-51-38-000-002-A. RAN OPERATIONAL TEST OF EMERGNECY LIGHT SYS CHECKS GOOD. A/C OK FOR SERVICE/END/