What was found
AFTER TAKEOFF, ATTEMPTED TO RAISE GEAR. HANDLE MOVED TO THE UP POSITION, BUT THE GEAR REMAINED EXTENDED. NO OTHER INDICATIONS PRESENT - NO CAS MESSAGE, NO RED LIGHT, THREE GREEN REMAINED ON, NO AUDIO WARNINGS. HANDLE PLACED TO DOWN POSITION FOR LANDING AND LANDING WAS UNEVENTFUL. SUP: TROUBLESHOT LANDING GEAR CONTROL, C/W LANDING GEAR RETRACT CK GOOD. IAW AMCC REQUEST REMOVED AND REPLACED LANDING GEAR CONTROL WITH A REPAIRED UNIT IAW MM CK 32-30-10, GEAR RETRACT CHECK CHECK GOOD.