What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO SEA DUE TO THE FLIGHT CREW REPORTING THAT THE #1 ENGINE EGT GUAGE SHOWS AMBER XX INFLIGHT. THE AIRCRAFT LANDED SAFELY AT SEA AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE FOUND ALL 4 HARNESS ATTACHMENT STUDS DAMAGED ON EGT THERMOCOUPLE OUTBOARD LOWER. MAINTENANCE REPLACED THE #1 ENGINE EGT HARNESS (AALA202502119539) PER AMM 77-21-43 ALONG WITH ALL 4 THERMOCOUPLES ON THE #1 ENGINE PER AMM 77-21-15. (POSITION L1 - AALA202502117570, POSITION L2 - AALA202502111588, POSITION R2 - AALA202502110145 AND POSITION R1 - AALA202502116976) A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.