As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELEC LIGHT ILLUMINATED AT GATE. ACFT GROUNDED. POWERED DOWN ACFT, PERFORMED BITE CHECK AND NOTED INTERMITTENT SPCU FAULT DUE TO GROUND POWER ISSUE, CLEARED FAULT AND ELEC LIGHT EXTINGUISHED IAW FIM 24-31 TASK 801, AND FIM 24-34 TASK 802.