As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE LP1 STATUS MESSAGE. APPROX 3 HRS INTO FLIGHT. NO STATUS MESSAGE ON ENGINE PAGE. (FIM 26150700) WIRING CHECK OK IAW FIM 26-15-00, FIG.103. REPLACED APU FIRE DET 1 CARD M685. OPS CHECK OK IAW FIM 26-15-00. MESSAGE CLEARED. SYSTEM TEST OK