As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MODE CONTROL PANEL L NAV ENGAGE LIGHT INTERMITTENT IN ALL MODES. ACFT GROUNDED. ACCOMPLISHED DFCS FFR, NO RECORDED FAULT ON EITHER CHANNEL FOR DAY OF EVENT. MCP PUSH BUTTON TEST PASSED NUMEROUS TIMES. NO HISTORY PAST 60 DAYS IAW AMM 22-11-00.