As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT AT FL 220 HAD INTERMITTENT MASTER FIRE WARNING LIGHT AND TESTED ENGINE AND CARGO FIRE SYSTEMS, ALL TESTED OK. DURING CRUISE AT 330 ABOUT 30 MINS LATER, APU FIRE LIGHT ILLUMINATED. NO WARNING BELL JUST THE LIGHT IN THE HANDLE. RAN RED TABS PULLED FIRE HANDLE AND PUSHED DISCHARGE BUTTON. (OPEN)