As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ACCOMPLISHMENT OF T/C 78273000 #1 ENGINE HAS ECONOMIC FAULT MSG 77-20861 "THE BOTTOM LEFT EGT SIGNAL (T495 S3) IS OUT OF RANGE. GROUNDED - YES. T/S PER B737-900 FIM 79-21 TASK 803 AND FOUND T495 S3 AT FAULT. REMOVED AND REPLACED T495 S3 (BOTTOM LEFT) T49.5 EGT PROBE AND TEST NML PER B737-900 AMM 77-21-01. OK FOR SVC.