What was found
DURING LINE MAINTENANCE, THE LEFT AFT EPSU FAULTED THE BATTERY INTERNAL AND EXTERNAL LOADS. REPLACED POWER SUPPLY, OPERATIONAL CHECK OK.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING LINE MAINTENANCE, THE LEFT AFT EPSU FAULTED THE BATTERY INTERNAL AND EXTERNAL LOADS. REPLACED POWER SUPPLY, OPERATIONAL CHECK OK.