What was found
AFTER TAKEOFF, RT MAIN GEAR WOULD NOT RETRACT, FLYING AT APPROX. 200 KTS. THE RT MAIN GEAR LIGHT WAS ON ALONG WITH THE GEAR UNSAFE LIGHT, THE HYDRAULIC LIGHT DID GO OUT. RAN THE EMERGENCY GEAR EXTENSION CHECK LIST AND BLEW THE GEAR DOWN, GOT THREE GREEN LIGHTS AND LANDING WAS NORMAL. ITEM IS UNDER INVESTIGATION.