As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT RETURNED TO PLATFORM DUE TO AFTER RT ENGINE START, IT WAS HAD OSCILLATIONS BETWEEN 540 AND 580 CELSIUS DEGREES OF EGT. ACFT WAS SENT TO THE HANGAR AND MX PERSONNEL REPLACED THE LOWER AND UPPER EGT PROBES AND HARNESS T-49 IAW MM 77-21-01 AND 77-21-05, TESTED CORRECT.