As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - INFLIGHT EWR-MIA. CREW REPORTED AUXILIARY POWER UNIT FAILED IN FLIGHT WITH LEFT GENERATOR ON PLACARD. EMERGENCY DECLARED DIVERTED JFK LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT GENERATOR AND AUXILIARY POWER UNIT DOOR SWITCH. SYSTEM GROUND CHECKED NORMAL OPERATION.