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 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 CHECK GOOD. AIRCRAFT WAS GROUNDED.