As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON STARTING NR 2 ENG, GOT MASTER FIRE WARNING LIGHT AND HORN. NO TEE HANDLES ILLUMINATED. SHUT DOWN NR 2 ENG APU EGT WAS NORMAL. ALL TEST OK. RAN ENG, UNABLE TO DUPLICATE PROBLEM. REPLACED FIRE WARNING CONTROL MODULE AS PRECAUTIONARY. ALL TEST OK.