As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA INFLIGHT - CREW REPORTED NR 1 ENGINE DRIVEN GENERATOR CYCLED ON AND OFF AFTER TAKEOFF FOLLOWED BY NAVIGATION DATA AND DISPLAY GUIDANCE COMPUTER INPUT LOST. RETURNED TO LGA AND LANDED WITHOUT INCIDENT. REPLACED NR 1 ENGINE DRIVEN GENERATOR. SYSTEM GROUND CHECKED NORMAL OPERATION.