As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FMC INTERROGATION FOR ENGINE FAULTS, THE NR 2 ENGINE RECENT FAULT CODE 73-10312 FOR THE START SWITCH SIGNAL AND ARINC BUSS DISAGREE. ACFT GROUNDED. PERFORMED FIM 73-24, TASK 813, NO FAULTS FOUND DURING INITIAL EVALUATION. FAULT CODE 73-10312 WAS ALSO NOT ACTIVE IN RECENT FAULTS OR FAULT HISTORY. PERFORMED REPAIR CONFIRMATION IAW FIM 73-24 TASK 813. ALL TESTS PASSED, FAULT NO LONGER ACTIVE. CLEARS THE PLT.