As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RTB DUE TO FMC ANUNCIATOR LIGT ILLUM ON LT ENG STARTUP. REPLACED FMC IAW AMM CROSS LOADED FMS SOFTWARE IAW AMM. ALL CHECKS GOOD. R & R L FMC IAW THE MM. CROSS LOADED FMS SOFTWARE IAW THE MM CHECKS OK. MCO AND PLAC REMOVED ETOPS CATEGORY 'E': PROBLEMS WITH SYSTEMS CRITICAL TO ETOPS