As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLUE MAINTENANCE LIGHT ILLUMINATED AFTER NORMAL APU START. ACFT GROUNDED. ACCOMPLISHED BITE CHECK REF AMM 49-60, FIM TASK 801, NO CURRENT STATUS FAULTS OR RECENT FAULT HISTORY. STARTED APU WITH SUCCESSFUL GROUND VERIFICATION, OPERATED NORMALLY WITH NO BLUE MAINT LIGHT.