As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT GATE, GROUND POWER FAILED TWICE, STARTED APU, AFTER PUSHBACK NOTICED BEEPING SOUND AND A ELECTRICAL LIGHT ILLUMINATED ON OVERHEAD PANEL. ACFT GROUNDED. PERFORMED FIM TASK AMM 24-34-802, FOUND SPCU INOPERATIVE LIGHT ON. RESET BOTH CIRCUIT BREAKERS SPCU NORMAL AND SPCU STBY. SUCCESSFULLY RESET. ALSO FIM TASK 24-31-801. FAULTS CLEARED. NO OTHER FAULTS NOTED. TESTED NORMAL.