As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RJNN - AT CRUISE ALTITUDE APU FIRE WARNING LIGHT CAME ON AND FIRE BELL SOUNDED. PULLED FIRE HANDLE, LIGHT STAYED ON. DISCHARGED FIRE BOTTLE AND LIGHT IMMEDIATELY WENT OUT. INSPECTED APU COMPARTMENT. NO FIRE DAMAGE FOUND. FOUND CHAFED FIRE DETECTION WIRE RIGHT UPPER SIDE. REPAIRED WIRE, OPS CHECK GOOD PER MM 26-15-00. (M)