As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - INFLIGHT, CREW REPORTED LEFT BUSS CIRCUIT BREAKER POPPED FOLLOWED BY THE WEATHER RADAR, LEFT FLIGHT DIRECTOR, ACARS, UPPER EICAS AND AUTO THROTTLE GOING OUT. RETURNED TO JFK AND LANDED WITHOUT INCIDENT. REPLACED THE BUSS POWER CONTROL UNIT. SYSTEM GROUND CHECKED NORMAL OPERATION.