As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO PUSH, RECEIVED AN ELECTRIC LIGHT ON OVERHEAD ELECTRICAL PANEL STAYS ON W/ APU ON GROUND POWER. ACFT GROUNDED. ACCOMPLISHED ELECTRICAL LIGHT MESSAGE BITE PROCEDURE IAW FIM 24-31, TASK 801. FOUND SPCU INOPERATIVE MAINT MESSAGE. ACCOMP FIM 24-34, TASK 802. RESET SPCU NORMAL, CLEARED SPCU MAINT MESSAGE. FAULT IS INTERMITTENT. ACFT OK FOR SVC. TECH SERVICES REQUEST TO REPLACE SPCU FOR BENCH CHECK. REPLACED SPCU. SPCU INSTALLATION TEST GOOD REF AMM 24-34-11.