What was found
NR 1 ENGINE TREND DATA CONTINUES TO SHOW ERRORS INDICATIVE OF EGT INDICATION SYS ANOMALIES. ALL OTHER PARAMETERS ARE NORMAL. COCKPIT INDICATION IS STILL WITHIN RANGE. ACFT GROUNDED. ACCOMPLISHED RESISTANCE CHECKS IAW TASK 77-21-01-801-F00, SUBTASK 77-21-01-760-001-F00 A) B) & C). FOUND T49.5 PROBE, S4 HAS HIGH RESISTANCE. APPROX 6 OHMS. AS PRECAUTIONARY, CLEANED ALL CONNECTORS WITH CONTACT CLEANER AND RE-ASSEMBLED IAW INSTALLATION TASK 77-21-01-400-801-F00. R & R T49.5 S4 PROBE IAW AMM REF 77-21-01-000-801/77-21-01-400-801-F00. OPS CKS GOOD.