As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA - FLT 4371 - AFTER TAKEOFF THE ESSENTIAL AND RIGHT MAIN ELECTRICAL BUS DROPPED OFF LINE. CREW DECLARED AN EMERGENCY DUE TO LOOSING THE GEAR INDICATION TEST FUNCTION. AIRCRAFT RETURNED TO LGA AND LANDED WITHOUT INCIDENT. MAINTENANCE RESET RIGHT MAIN BUS CIRCUIT BREAKER AND REPLACED PDU AS PRECAUTIONARY MAINTENANCE. AIRCRAFT RETURNED TO SERVICE. (M)