What was found
DURING CLIMB, ENG CLIMB POWER ENG 1 EGT EXCEEDENCE 993'C MAX. TOTAL EXCEEDENCE TIME APPROX 15 SEC. NO ERRATIC N1, N2, OR F/F. EGT ROSE GRADUALLY & THEN SLOWLY DECLINED AS THROTTLE REDUCED TO IDLE. EGT IN LIMITS WITH THROTTLE REDUCED. NO FIRE WARNINGS. ATB & DECLARED AN EMERGENCY. INTERRIGATED NR 1 & 2 VIA ENG PEAK 992.5, EXCEEDED 925 DEGREES FOR 18.3 SECONDS. N1 104.3, N2 97.1 THE ACARS SYSTEM RECORDED THE EVENT WHICH CLEARLY POINTS TO AN EGT INDICATION PROBLEM & NOT AN ACTUAL PERFORMANCE ISSUE. REPORT SHOWS TEMP INCREASED 110 DEG C IN 1 SEC WITH NO OTHER PARAMETER CHANGES, WHICH IS BEYOND THE INDICATION CAPABILITY. R&R FWD, THERMOCOUPLE & HARNESS IAW AMM 77-21-01-2. PERF HIGH PWR ENG RUN IAW THE JRH AND AMM 72 ALL IND WITHIN LIMITS.