As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT RETURNED TO DEPARTURE DUE TO A RIGHT ENGINE EXHAUST GAS TEMPERATURE (EGT) INDICATIONS WERE ERRATIC. LANDING UNEVENTFUL. REMOVED AND REPLACED THE NR 1 AND 5 EXHAUST GAS-IMMERSED THERMOCOUPLE PROBES IAW AMM 77-21-00. OPERATIONAL CHECKED GOOD. AIRCRAFT WAS GROUNDED.