As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENG RECORDED FAULT CODE 73-11681 ADIRU PS AND THE ENG PO SIGNALS DISAGREE. SHORT TERM FAULT. FAULT ACTIVE ON 2 OF LAST 4 LEGS, FLT LEGS 2 & 3. ACFT GROUNDED. ACCOMPLISHED T/C 78273000, FOUND CURRENT FAULT MSG 73-11681 AND FAULT HIST PAGE LOGGED MSG 76-31361 AND 73-10171 WITHIN THE LAST 10 FLT LEGS. PERFORMED FIM TASK 73-28 TASK 805. REPLACED NR 1 ENG EEC IAW AMM 73-21-60/401. ALL EEC INSTALLATION REQUIRE TESTS PASSED.