As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LT ENG START AND APU SHUTDOWN LEFT GEN OFF LIGHT WITH LT ISOLATION BUSS TIE LIGHT. RAN ENG CYCLED POWER FOR LT ENG AND APU SEVERAL TIMES WITH LOAD ON GENERATORS. PERFORMED BITE AND BPCU HAD PILOT DUPLICATE POWER TRANSFER. WHEN PROBLEM OCCURRED NO FAULTS NOTED. LT GEN AND APU AND A/C POWER OPS CHEC K NORMAL AS PER AMM.