What was found
DURING LINE MAINTENANCE, THE CABIN INTERCOMMUNICATION DATA SYSTEM FAULTED THE LEFT AFT EMERGENCY POWER SUPPLY UNIT. REPLACED EPSU. OPERATIONAL CHECK OK.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING LINE MAINTENANCE, THE CABIN INTERCOMMUNICATION DATA SYSTEM FAULTED THE LEFT AFT EMERGENCY POWER SUPPLY UNIT. REPLACED EPSU. OPERATIONAL CHECK OK.