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, FOUND FAULT CODE 73-30311 ON NR 1 ENGINE, START SWITCH SIGNAL AND BUSS DATA DISAGREE. ACFT GROUNDED. PERFORMED FURTHER TROUBLESHOOTING IAW FIM REF 73-24, TASK 813. NO CURRENT FAULT. NUMEROUS PREVIOUS FAULTS. EEC TEST PASSED. DUE TO HISTORY, R & R ENGINE NR 1 START SWITCH IAW AMM REF 80-11-00-401/80-11-00-501. OP'S CHECKED GOOD.