What was found
NR 2 ENGINE MAX POWER ASSURANCE EGT INDICATION IS HIGH AT 65% N1. INDICATION ERROR IS SUSPECTED: S1 = 535, S2 = 558, S3 = 697, S4 = 545. ACFT GROUNDED. INITIAL EVAL UPON RETURN TO HANGAR: T495 = 126.91, S1-113.05, S2-88.53, S3-195.05, S4-109.14. ACCOMPLISHED EGT CLEANING IAW AMM 77-21-00-140-801. VISUAL INSPECTION OK, POST CLEANING RESULTS: T495 = 37.96 , S1- 44.87, S2- 31.03, S3- 31.09, S4- 44.79, EEC TEST PASSED. ALSO ACCOMPLISHED T49.5 PROBE AND EGT SYSTEM INSPECTION IAW AMM 77-21-01-200-801, CJ9 CONNECTOR DP0911 S2 PINS 9 TO GROUND, 10 TO GROUND FAILED INSULATION RESISTANCE TEST IAW STEP (2) TABLE (2). FOUND PROBES S1-S4 AND CJ10 & CJ9 HARNESSES TO BE OUT OF LIMITS PER EGT SYSTEM INSPECTION AMM 77-21-01-200-801-F00. REPLACED ALL 4 PROBES PER AMM 77-21-01/401. OPS CHECK GOOD, REPLACED THE CJ9 & CJ10 HARNESS IAW AMM 73-21-06/401. ALL OPS CHECK OF THE CJ9 & CJ10 HARNESS COMPLETE. ACCOMPLISHED POWER ASSURANCE TEST 5 & ACTUATORS TEST 12 OF AMM 71-00-00-700, ALL INDICATIONS AND PARAMETERS WITHIN LIMITS.