What was found
DURING TAXI, THE PILOT REPORTED THE NR 1 ENGINE EGT EXCEEDED DURING TAXI TO 720°C, THEN THE TEMPERATURE DROPS TO -10°C, AFTER THAT INDICATION STABILIZED, THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE PERFORMED FAULT ANALYSIS IAW TSM 77-00-00-810-934-A, INSPECTED THE EGT HARNESS, JUNCTION BOX AND THERMOCOUPLES, NO DAMAGES WERE FOUND, BUT HUMIDITY CONDITION. PERFOMED DRY OUT OF THE EGT HARNESS AND JUNCTION BOX IAW AMM 77-21-43-350-801-A, THEN PERFORMED OPERATIONAL CHECK OF FADEC1 IAW AMM 73-22-00-710-040-A WITH NORMAL RESULT. THE AIRCRAFT WAS RETURNED TO SERVICE.