What was found
AFTER TAKEOFF WE RECEIVED A GEAR DISAGREE WITH NOSE GEAR DOWN AND MAINS UP. RAN QRH LANDED WITHOUT INCIDENT. A/C WAS CARRYING 5 PASSENGERS, NO JUMPSEATER, WITH CA FLYING. FA AND PAX WERE NOTIFIED AND NO ADVERSE REACTIONS NOTED. FIRE/EMS RESPONDED DUE TO EMERGENCY DECLARED. "AIRCRAFT REMOVED FROM SERVICE" REMOVED AND REPLACED RELAY K1RH FROM JCT BOX #3. IAW W/W 23-51-00. A/C REQUIRES GEAR SWING. PERFORMED FUNCTIONAL CHECK THE LANDING GEAR. EXTENSION AND RETRACTION SYSTEM. IAW AMM 32-30-00. OPS CHECK GOOD.