As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: WHILE ACCOMPLISHING A05 CHECK MAINTENNCE FOUND FORWARD EMERGENCY POWER SUPPLY UNIT FAULTING DURING SYSTEM TEST. REPLACED FORWARD EMERGENCY POWER SUPPLY UNIT (AALA202308173090) AND BATTERY (AALA202308172928). A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.