As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: CIDS1 EMERGENCY POWER SUPPLY UNIT SYSTEM TEST DID NOT PASS TEST INDICATING EMERGENCY POWER SUPPLY UNIT 11WL BATTERY FAULT MESSAGE. REPLACED BATTERY AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-38.