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 INOPERATIVE. REPLACED EPSU 12WL PER AMM TASK 33-51-38-400-001-A. PERFORMED OPERATIONAL CHECK PER AMM TASK 33-51-00-710-00-A, AND BONDING CHECK PER AMM 20-28-00-869-002-A.