As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT, APU FIRE WARNING LIGHT AND BELL CAME ON. FIRE SWITCH PULLED AND BOTTLE DISCHARGED. FIRE WARNING INDICATIONS CONTINUED AFTER APU SHUTDOWN AND EMERGENCY ACTION ITEMS COMPLETED. REPLACED SURGE BLEED VALVE BOOT PER B747 MM 49-53-01. OPS CHECK PER B747 MM 49-53-01. BOTH FIRE CARDS CHANGED PER B747 MM 26-10-000 PAGE 401. OPS CHECKED PER MM 26-15-00.