As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT CREW REPORTED RT GEN MESSAGE. QRH PROCEDURE UNSUCCESSFUL. AIRCRAFT RETURNED TO ACC ADDITIONAL INFO: BPCU INTERROGATED UPON ARRIVAL. RT GEN DIODE FAULTED. PARTS AND PERSONNEL REQUESTED FROM JFK PER MCC. RT IDG AND GCU REPLACED. OPS CHK NORMAL. A/C DEPARTS AT 2313 GMT