As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 269, BOS-FLL. DURING BLOCKING IN GATE F4 FFL GROUND POWER DID NOT CONNECT PROPERLY (TWICE). AIRCRAFT DID NOT HAVE APU RUNNING. EMERGENCY CABIN LIGHTING DID NOT ILLUMINATE DURING THESE NON-POWERED EVENTS. FOUND FWD, MID AFT EMERGENCY LIGHT BATTERIES DEAD. REMOVED AND REPLACED FWD, OVERWING AND AFT GALLEY BATTERIES IAW AMM 33-51-38. LIGHT TEST GOOD.