As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT ILLUMINATED DURING APU START IAW QRH, WAITED 5 MINUTES LIGHT EXTINGUISHED AFTER ABOUT 3:30 MINUTES. SECOND START NORMAL AND SUCCESSFUL. OAT 36C. ACFT GROUNDED. DURING START APU CURRENT STATUS FAULTS 49-41251 SCU SHOWS HIGH TEMPERATURE. REPLACED APU SCU REF MM 49-41-61, GROUND VERIFICATION TEST PASSED.