As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - THE EMERGENCY LIGHTS FLASH ON AND OFF. MAINTENANCE REPLACED A BATTERY PACK AND THE 'A' CHANNEL AND 'B' CHANNEL DECODER/ENCODER UNITS, AND PERFORMED A CABIN INTERCOMMUNICATION DATE SYSTEM RESET FOR TROUBLESHOOTING. MAINTENANCE REPLACED AN EMERGENCY POWER SUPPLY UNIT TO FIX THE PROBLEM. OPERATIONALLY CHECKED OK. (M)