As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA FLIGHT T1060/02OCT - AUXILIARY POWER UNIT AND EXTERNAL POWER FAILED AFTER PARKING. PASSENGERS REPORTED EMERGENCY LIGHTS IN CABIN INOPERATIVE. FLIGHT ATTENDANTS REPORTED EXIT LIGHTS ON. RESET CIRCUIT BREAKER FOR EMERGENCY LIGHTS IN CABIN. SYSTEM GROUND CHECKED NORMAL OPERATION.