As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING EMERGENCY POWER SUPPLY UNIT SYSTEM TEST MAINTENANCE FOUND CLASS 1 FAULT "EPSU(11WL)EXT L. MAINTENANCE REINSTALLED EMERGENCY POWER SUPPLY UNIT 11WL CONNECTOR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-38.