As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE HAS FAULT 73-31371, UPPER EGT SECTORS READING HIGH. ECONOMIC FAULT. ACFT GROUNDED. ACCOMPLISHED INITIAL EVALUATION OF B737-800 FIM 73-11 TASK 801 FOR #1 ENGINE. SECTORS 1 & 4 PARAMETERS WITHIN 100 DEGREES OF SECTORS 2 & 3. EEC TEST PASSES WITH NO FAULTS. NO MX MESSAGES IN RECENT FAULTS.