As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW DID AIR RETURN TO RJTY FOR AN ERRATIC EGT ON NR 3. EGT FLUCUATES BETWEEN +/- 30 DEGREES. CREW SHUTDOWN ENGINE AND OIL PRESSURE WAS ZERO PSI. CREW THEN RETURNED THE AIRCRAFT TO RJTY AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT NR 3 ENGINE EGT SYSTEM AND FOUND BAD CFM 56-2C1 EGT HARNESS. MAINTENANCE THEN REMOVED AND REPLACED HARNESS PER ALL APPLICABLE MANUALS. AIRCRAFT WAS RETURNED TO SERVICE.