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, FOUND ECONOMIC FAULT MESSAGE 77-20861, THE BOTTOM LEFT EGT SIGNAL (T495S3) IS OUT OF RANGE. ACFT GROUNDED. FOUND NO DATA ON INPUT MONITORING PAGE FOR LOWER LEFT S3 EGT SENSOR. ALL DASHES. ACCOMPLISHED EGT CLEANING IAW AMM 77-21-00-140-801. S3 DATA CAME ON. S2 AN S3 TEMPS ARE NOW ONLY 2DEG C DIFF . WELL WITHIN RANGE REF LOG 11840708 FOR POST CLEANING RECHECK.