As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMP T/C 78273000, FOUND NR 1 ENGINE WITH LONG TIME FAULT 73-31691, ADIRU 1 AND ADIRU 2 TAT DATA FROM DEU 1 AND DEU 2 IS MISSING. ACFT GROUNDED. PERFORMED FAULT ISOLATION TEST IAW FIM 73-28 TASK 806. EEC BITE TEST PASSED. NO FAULTS FOUND. DETERMINED TO BE INTERMITTENT FAULT. NO HISTORY. OK FOR SERVICE.