As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, EXPERIENCED INTERMITTENT FIRE WARNING ON NR 3 ENGINE WHICH CEASED UPON POWER REDUCTION AND RECURRED DURING DESCENT INTO SJC. INSPECTION REVEALED A CLAMP ON THE COWLING CONTACTING THE FIRE SENSOR ELEMENT. REPOSITIONED CLAMP ON COWLING AND SYSTEM CHECKED OK. AIRCRAFT RETURNED TO SERVICE.