As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU DET INOP LIGHT IS ILLUMINATED. FAULT VERIFIED. ACCOMP FIM:26 10/801 FIRE DET BITE. FOUND APU FAN UPPER FAULT PER FIM RANG OUT ALL 3 DET LOOPS AND FOUND LOOP M1925 TAILPIPE OUT OF LIMITS. REPLACED APU TAILPIPE OVERHEAT DET ASSY REF MM 26 15 01, OPS CHECK NORMAL. SEAMC NOTIFIED.