As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BTB - CAPT L FMC QUIT AFTER ENG START. RETURNED TO GATE WHEN APU GEN TRANSFERRED L FMD START AGAIN. RAN BOTH ENGS. COULD NOT DUPLICATE PROBLEM. AS PRECAUTION RERACKED L FMC. GND OPS CHK OK PER AMM 34-61-01. PERFORMED TASK 30, NO FAULTS NOTED. A/C OK TO REMAIN IN LAND 3.