As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIAGNOSTICS HAS ISSUED AN CNR20190105027 FOR NR 2 ENG INCREASE IN DELTA EGT AND A DECREASE IN EGT HOT DAY MARGIN. INDICATION ERROR IS SUSPECT. GROUNDED - YES. REMOVED AND REPLACED TOP LEFT T49.5 S4 PROBE AS PRECAUTIONARY IAW AMM 77-21-01. GROUND VERIFICATION TEST IS GOOD. POST T49.5 READINGS ARE S1 34.4, S2 17.2, S3 16.9, S4 34.1 CLEARED EEC FAULTS.