As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: RIGHT WING, OFF WING EMERGENCY HATCH EMERGENCY POWER SUPPLY UNIT FAILED TEST. REMOVED AND REPLACED EMERGENCY POWER SUPPLY UNIT FOR RIGHT OFF WING HATCH. INSTALLATION AND OPERATIONS CHECKED GOOD PER AMM 33-51-00.