As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE ATL-LGW, HAD AUTOSLAT FAIL, NR 3 OIL PRESS INVALID AND NR 3 HYD QUANTITY INVALID ANNUNCIATED. DIVERTED TO JFK. SWAPPED TRANSFORMER WITH UNIT INSTALLED IN LOCATION T1-187 AFT CARGO LOADING SYSTEM. NR 3 28VAC BUS, OPS NOW NORMAL.