As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE, EPSU (EMERGENCY POWER SUPPLY UNIT) 12WL IN PASSENGER CABIN INOPERATIVE. REMOVED AND REPLACED EPSU 12WL PER AMM TASK 33-51-38-400-001-A. PERFORMED OPERATIONAL CHECK PER AMM TASK 33-51-00-710-001-A, CHECKED OKAY. BONDING TEST OKAY PER AMM TASK 20-28-00-869-002-A.