As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE DETECTION TEST FAILED. ACFT GROUNDED. APU FIRE DETECTION CONTROL MODULE BITE DONE IAW FIM 26-10, TASK 801. NO FAULTS DISPLAYED. APU FIRE DETECTION OPS TESTED SUCCESSFULLY IAW AMM 26-15-00-710-801. GROUND VERIFICATION SUCCESSFUL.