What was found
DIAGNOSTICS REPORTED THE NR 1 ENGINE TREND DATA SHOWS A SHIFT IN DELTA EGT AND EGT HOT DAY MARGIN ALL OTHER PARAMETERS NORMAL. EGT INDICATION ERRORS ARE SUSPECT. ACFT GROUNDED. ACCOMPLISHED A NR 1 ENGINE EGT CONNECTOR CLEANING IAW AMM 77-21-00-140-801, ALL CONNECTORS IN TABLE 2 CLEANED. PERFORMED A NR 1 ENGINE T49.5 PROBE AND EGT SYSTEM INSPECTION IAW AMM 77-21-01-200-801-F00. ALL RESISTANCE READINGS WITHIN MM LIMITS. PERFORMED A NR 1 ENGINE EEC TEST IAW AMM 73-21-00-700-804-F00. ALL TESTS PASSED. ALL TSR STEPS COMPLETE.