What was found
ON APPROACH, SELECTED GEAR HANDLE DOWN, PUMP RAN, GEAR UNSAFE LIGHT ILLUMINATED, GEAR DOORS DID NOT OPEN, RECYCLED GEAR AND STILL UNSAFE. CONTACTED MAINTENANCE CONTROL AND PULLED THE T-HANDLE AND PUMPED THE GEAR DOWN, GEAR CAME DOWN WITH THREE GREENS. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED HYDRAULIC PUMP, RELAY 15GA (PN M83536/6-022L) AND SOCKET 15GA-31 (PN RSE120060). ALL CHECKS GOOD.