As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING T/C 78273000 (ENGINE FMC CDU FAULTS) FOUND MAINT MSG NR 73 30312 (START SWITCH AND ARINC BUS DATA DISAGREE) FOR NR 2 ENGINE. PERFORMED FIM TASK 73 24 00 810 813 F00 STEPS A THRU E.2.I.1. AND STEPS G 1. THRU G.3.G. NO DISCREPANCIES NOTED AT THIS TIME. PERFORMED ENGINE FMC T/C 78273000, NO FAULTS LOGGED FOR PAST 5 LEGS.