As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING TC 78273000, FOUND NR 1 ENGINE TO HAVE ECONOMIC MESSAGE 73-31371 ON FLIGHT LEG 2. NO HISTORY 90 DAYS. ACFT GROUNDED. NOT SHOWING ANY RECENT FAULTS OR LOGGING ANY FAULTS IN FAULT HISTORY. FAULT CODE 73-31371 UPPER EGT SECTORS READING HIGH. PERFORMED EEC BITE TEST REF FIM 73-00, TASK 801. NO DEFECTS NOTED.