As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING EMERGENCY POWER SUPPLY UNIT CIDS 1 SYSTEM TEST FOUND BATTERY/EMERGENCY POWER SUPPLY UNIT 13WL AFT LEFT FAULT MESSAGE. MAINTENANCE RESEATED CONNECTOR ON EMERGENCY POWER SUPPLY UNIT 13WL AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-00-710-001-A WITH NO FAULTS NOTED.