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