As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POWER TRANSFER FROM GPU TO APU, ELEC LIGHT CAME ON WITH SPCU 1 FAIL. CYCLED NORM SPCU AND STBY SPCU CIRCUIT BREAKERS THEN CLEARED FAULT IAW FIM 24-31 TASK 801, GROUND FUNCTIONAL CHECK GOOD IAW AMM 24-34-11-400-801 PARA G, NO HISTORY LAST 30 DAYS.