As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GE DIAGNOSTICS REPORTS #2 ENGINE TREND DATA SHOWS A SHIFT IN EGT HOT DAY MARGIN ALL OTHER PARAMETERS NORMAL. EGT INDICATION ERRORS ARE SUSPECT. GROUNDED - YES. REMOVED AND REPLACED CJ10 HARNESS REF B737-900 AMM 73-21-06. FADEC SYSTEM TEST GOOD REF 73-21-00.