What was found
CREW RECEIVED LANDING GEAR INOPERATIVE, WT ON WHEELS AND A FUSELAGE DOOR MASTER WARNING. DUE TO WEATHER AT DESTINATION, ELECTED TO DIVERT, AND DECLARED AN EMERGENCY FOR CREW. ABOUT 30 MILES FROM DEVERSION AIRPORT, CREW SELECTED GEAR DOWN AND SAW NO LIGHTS ON THE GEAR INDICATOR. CREW USED ALTERNATE LANDING EXTENSION PROCEDURE AND DETERMINED GEARS WERE EXTENDED. LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND THE LANDING GEAR SELECTOR HAD FAILED. MAINTENANCE R & R LANDING GEAR SELECTOR IAW AMM AND OPS CHECKED GOOD. ACFT IS GOOD FOR SERVICE.