As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REFERENCE LP60035512 FOR PLT DEFERRAL ENGINE NR 1 ECONOMIC FAULT MSG NBR 77-20861 THE BOTTOM LEFT EGT SIGNAL IS OUT OF RANGE. GROUNDED - YES. REPLACED T49.5 S3 PROBE AND SYS IND NML - BOTTOM LEFT EGT SIGNAL IN RANGE. REF B737-800 AMM 77-21-01/401.