As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, ELEC LIGHT ILLUMINATED. ACFT GROUNDED. PERFORMED FIM 24-31 TASK 801, FAULT SHOWN SPCU INOP. FIM 24-34 TASK 802, PERFORMED INITIAL EVALUATION, CYCLED 2 CIRCUIT BREAKERS AND WAS ABLE TO CLEAR THE MAINTENANCE MESSAGE. ELEC LIGHT NO LONGER ILLUMINATED. CYCLED BUSSES BETWEEN APU AND GND POWER TO SEE IF FAULT WOULD RETURN, CHECKED GOOD. IAW FIM. REPAIR CONFIRMATION GOOD. SPCU INSTALLATION TEST GOOD PER B737-900 AMM 24-31-11.