As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LG LEVER DISAG WARNING MESSAGE CAME ON WHEN LANDING GEAR FAILED TO EXTEND WITH THE LANDING GEAR LEVER. RAN QRH FOR THE WARNING AND THEN RAN NAP 1-20. LANDING GEAR EXTENDED WHEN WHEN WE FLIPPED THE ELECTRIC OVERRIDE SWITCH. (FLIGHT 5683 FILED OPEN)