As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: INTERNAL LOAD FAULT MESSAGE FOR AFT LEFT EMERGENCY POWER SUPPLY UNIT DISPLAYED DURING SYSTEM TEST. REPLACED AFT LEFT EMERGENCY POWER SUPPLY UNIT AND ACCOMPLISHED A SATISFACTORY OPEWRATIONAL CHECK PER AMM 33-51-38.