As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AIRCRAFT POWER DROPPED OFF EMERGENCY LIGHTS FAIL TEST. REPLACED 4 EMERGENCY POWER SUPPLY UNIT BATTERIES AT POSITIONS 10WL (AALA202208112862), 11WL (AALA202208110739), 12WL (AALA202208115289) AND 13WL(AALA202208116422) PER AMM 33-51-38. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.