As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING 26LOOO25012 ACCOMPLISHMENT EMERGENCY POWER SUPPLY UNIT BITE TEST FAULTS EMERGENCY POWER SUPPLY UNIT (11WL) EXIT LIGHT/ DECODER ENCODER UNIT B (300RH6). REMOVED AND REPLACED 300RH6 3L EMERGENCY POWER SUPPLY UNIT PER AMM 33-51-38.