As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2732, LGA-BOS. (AIRCRAFT DIVERTED TO JFK AND DECLARED AN EMERGENCY). ' AT ABOUT 500'AGL ON TAKEOFF FROM LGA, AC BUS 1 AND DC BUS 1 OFF EICAS AND MANY SUBSYSTEMS LOST; TECH SUPPORT REQUESTED. REF LOGPAGE 4104499, ITEM 1 AND ITEM 2. REMOVED AND REPLACED 1371 AND GCU 1. REMOVED AND REPLACED GLC 1 PER AMM 24-21-21. PERFORMED FUNCTIONAL CHECK OF AC BUS 1 AND DC BUS #1 WITH ENG RUN PER 71-00-01. NO FAULTS NOTED. OPS CHECK GOOD.'