As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING TASK CARD 78273000 FOUND ECONOMIC FAULT 73-31371, UPPER EGT SECTORS READING HIGH ON NR 1 ENGINE. ACFT GROUNDED. REMOVED AND REPLACED T49.5 PROBE S1 IAW AMM 77-21-01-000-801 F00 AND 77-21-01-400-801-F00. ACCOMPLISHED EEC TEST IAW AMM 73-21-00-700-804-F00. TEST PASSED WITH NO FAULTS. INPUT MONITORING READINGS FOR S1 AND S4 AFTER IDLE RUN WITHIN 25 DEGREES.