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 ESN862376 TREND DATA SHOWS A DELTA EGT INCREASE AND EGTHDM DECREASE. EGT INDICATION ERRORS ARE SUSPECT. GROUNDED - YES. REMOVED AND REPLACED CJ10 CORE ENGINE HARNESS PER B737-900 AMM 73-21-06. OPS CHECK GOOD PER AMM 73-21-00. REMOVED AND REPLACED S3 T49.5 PROBE PER AMM 77-21-01. T49.5 READINGS S1-33.41, S2-24.55, S3-24.65, S4-33.70. GROUND VERIFICATION TEST SUCCESSFUL.