As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN A LOOP ENGINE FIRE LIGHT ON NR 4 ENGINE ILLUMINATED MOMENTARILY THEN WENT OUT SWITCHED TO B LOOP LIGHT STAYED OUT FOR THE DURATION OF THE FLT. REPLACED PYLON SENSING ELEMENT AND INBD CORE SENSING ELEMENT OPS CK IS GOOD IAW M/M 26-10-1, P/N OF PYLON SENSING ELEMENT 472451 S/N REMOVED 5028 CORE ELEMENT P/N 472450 S/N REMOVED 5007.