As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GE DIAGNOSTICS REPORTS NR 2 ENGINE TREND DATA SHOWS A SUDDEN SHIFT IN EGT HOT DAY MARGIN ALL OTHER PARAMETERS NORMAL. EGT INDICATION ERRORS ARE SUSPECT. ACCOMPLISHED EGT CONNECTOR CLEANING REF MM 77 21 00, NO HELP. S4 VALUE OVER 200 DEG LOWER WHILE RUNNING ENG. FOUND CJ10 HARNESS INTERNALLY SHORTED TO GROUND. REMOVED AND REPLACED CJ10 HARNESS REF MM 73 21 06, GROUND VERIFICATION TEST PASSED.