As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE TREND DATA SHOWS A DECREASE IN EGT HOT DAY MARGIN. EGT INDICATION ERROR IS SUSPECTED GROUNDED - YES. REMOVED AND REPLACED #2 ENG J10 HARNESS REF B737-800 AMM 73-21-06 REVERSED DEACTIVATION OP CK GOOD. FAULT 77-20862 IS STILL PRESENT. TSR CLEARED.