As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING T/C 78273000 ON THE NR 2 ENGINE, FOUND ECONOMIC FAULT BOTTOM LEFT EGT SIGNAL (T495S3) IS OUT OF RANGE. MESSAGE 77-20862. ACFT GROUNDED. REMOVED AND REPLACED THE NR 2 ENGINE BOTTOM RIGHT T49.5 PROBE. PERFORMED T49.5 PROBE INSTALLATION TEST. TEST GOOD, NO FAULTS.