As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY. REFERENCE LP403130 ITEM 1 REF LP403125 ITEM 1. PILOT DISCREPANCY WITH POWER OFF. 2 AFT EMER EXIT SIGNS DO NOT ILLUMINATE. AC WAS IN FOR HVY CHECK THEN WAS GROUNDED DUE TO EPSU FAIL. CORRECTIVE ACTION: REMOVED AND REPLACED EPSU 13WL AFT L PER AMM 33-51-38-00/400-001. OPS CHECK GOOD NO FURHTER DEFECTS.AIRCRAT OKAY FOR SERVICE./END/