As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN FIRE WARNING INOP. GROUNDED YES. FOUND WIRE CHAFED AT REMOTE APU CONTROL PANEL & FIRE PROTECTION MASTER WARNING & CONTROL C/B POPPED. REPLACED REMOTE APU CONTROL PANEL REF MM 26 22 03 000 801. MAIN FIRE WARNING OPS NORMAL REF MM 26 15 00 & MM 26 11 00.