What was found
FLIGHT CREW REPORTED FOLLOWING LANDING GEAR EXTENSION (3) REDLIGHTS REMAINED ILLUMINATED WITH (3) GREEN DOWN AND LOCKED INDICATOR LIGHTS ILLUMINATED. PERFORMED LANDING GEAR EMERGENCY EXTENSION PROCEDURE A. FOUND MLG DOORS DID NOT RETRACT FOLLOWING MAIN GEAR EXTENSION. JACKED ACFT AND RESET EMERGENCY GEAR HANDLE. CYCLED LANDING GEAR THROUGH SEVERAL CYCLES WITH NO FAULTS NOTED. UNABLE TO DUPLICATE FAIL MODE, POSSIBLY DUE TO MOISTURE FREEZING IN LANDING GEAR POSITION SWITCHES.