As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERROGATED FMC CDU FOR ENGINE FAULTS, FOUND NR 2 ENGINE SHOWS RECENT FAULT 73-30312, FLT LEG 0 AND 1. THE START SWITCH SIGNAL AND BUSS DATA DISAGREE. ACFT GROUNDED. ACCOMPLISHED TASK 73-24 TASK 813 START SWITCH SIGNAL AND BUSS DATA DISAGREE. FAULT ISOLATION. NO FAULTS FOUND, GROUND VERIFICATION TESTS NORMAL. NO HISTORY 90 DAYS.