As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MASTER FIRE WARNING LIGHT ILLUMINATED IN FLIGHT INTERMITTENTLY. NO OTHER FIRE INDICATIONS. NR 2 ENGINE LOOP WILL NOT TEST REF AMM 26-11-000-1. REMOVED AND REPLACED ENG NR 2 SENSING ELEMENT IAW MM 26-11-012-4. OPS TEST NR 2 FIRE LOOP PER MM 26-11-000-5. OPS TEST NORMAL ON GROUND PER JRH RAN NR 2 ENG ALL INDICATION WERE NORMAL. OK TO CONTINUE.