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 A FAULT CODE APPEARED ON THE NR 1 ENGINE 73-31371 UPPER EGT SECTORS READING HIGH, ECONOMIC FAULT. ACFT GROUNDED. PERFORMED FIM 73-11 TASK 801. PERFORMED AMM 77-21-01. INSPECTED AND FOUND S3 AND S4 EGT PROBES OUT OF LIMITS. REMOVED AND REPLACED S3 AND S4 EGT PROBES IAW AMM 77-21-01. EEC TEST PASSED IAW AMM 73-21-00.