As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING T/C 78273000, FOUND NR 1 ENGINE ECONOMIC FAULT 73-31371 UPPER EGT SECTORS READING HIGH. ACFT GROUNDED. ACCOMPLISHED TROUBLESHOOTING IAW B737-800 FIM 73-11 TASK 801. NO DEFECTS NOTED. MESSAGE NOT ACTIVE IN RECENT FAULTS.