As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 EEC LOGGED 73-30311. START SWITCH SIGNAL AND ARINC BUSS DATA DISAGREE. ACFT GROUNDED. COULD NOT DUPLICATE MALFUNCTION. VERIFIED BOTH DEUS START SWITCH DISCRETES CORRECTLY & EEC BITE IS NORMAL WITH START SWITCH SELECTED TO ALL FOUR POSITIONS. REF FIM 73-24 TASK 813.