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 BUILT IN TEST EQUIPMENT TEST OF THE EMERGENCY POWER SUPPLY UNIT FOR L2 SLIDE REPLACEMENT FOUND 11WL EMERGENCY POWER SUPPLY UNIT BATTERY FAULTED. REPLACED 11WL EMERGENCY POWER SUPPLY UNIT BATTERY PER AMM 33-51-38.