As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT IDG MSG AND LIGHT. RTFL. RAN ENGINES FOUND DC-A 23 FOR NR 1 AND 13 FOR NR 2. AFTER DISCONNECTING APU GEN, NR 2 TRIPPED OFF AND WOULD NOT RESET. TRIED SWAPPING GCU'S BUT GEN WOULD NOT COME ONLINE SWAPPING BACK GCU'S GEN NR 2 CAME ONLINE BUT TRIPPED BEFORE TRYING TO TRANSFER POWER. TRIED NEW GPCU, BUT GEN NR 2 AGAIN DID NOT COME ONLINE AND WOULD NOT RESET. REPLACED NR 2 IDG, OPS NORMAL.