What was found
GE DIAGNOSTICS REPORTS #2 ENGINE (SN 963291) TREND DATA SHOWS A DELTA EGT INCREASE AND EGT HOT DAY MARGIN DECREASE. EGT INDICATION ERRORS ARE SUSPECTED. CNR 20230620039PRI2. GROUNDED - YES. #2 ENG FAULT HISTORY PAGE LOGGED FAULT MSG 77-20872 FOR THE LAST 10 LEGS. REF FIM TASK 77-21 TASK 804, INPUT MONITORING SHOWS S1: 63.06, S2: 34.31, S3: 34.64 AND S4: ---. EEC BITE TEST SHOWS CURRENT FAULT 77-20872. S4 EGT WIRING CHECKED GOOD PER AMM TASK 77-21-01-200-801-F00. REMOVED AND REPLACED EGT S4 PROBE PER AMM TASK 77-21-01-400-801-F00. EEC BITE TEST GOOD W/O FAULTS. POST EGT READINGS S1: 40.36, S2: 24.31, S3: 24.72 AND S4: 39.14. A/C RESTORED TO NORMAL CONFIG.