What was found
NR 1 ENGINE TREND DATA IS SHOWING A SHIFT IN DELTA EGT INDICATIVE OF EGT INDICATION SYS ANOMALIES. ALL OTHER PARAMETERS ARE NORMAL. ACFT GROUNDED. ACCOMPLISHED STEPS 1-3, FOUND S4 PROBE RESISTANCE OUT OF LIMITS AND FOUND CORE ENG HARNESS TO THE S1 PROBE RESISTANCE CHECK OUT OF LIMITS. R & R S4 PROBE REF MM 77-21-01, AND R & R CORE ENG HARNESS REF MM 73-21-06, OPS CK GOOD. PERFORMED EEC DISCRETES TEST 73-21-00-700-809-F00, EEC TEST 73-21-00-700-804-F00, AND ACTUATORS TEST 71-00-00-700-807-F00, ALL TESTS PASS.