What was found
ON CLIMB OUT, RETRACTED GEAR AND THE RT MLG WOULD NOT LOCK IN THE UP POSITION, WOULD EXTEND AND RE-CYCLE. EXTENDED GEAR NORMALLY AND HAD NORMAL GEAR EXTENSION AND DOWN AND LOCKED INDICATION. LANDED AT DEPARTURE AIRPORT WITHOUT INCIDENT. FOUND LANDING GEAR UPLOCK TO BE DIRTY AND STIFF, CLEANED AND LUBRICATED SAME, OPS CHECK SATISFACTORY FOR RETURN TO SERVICE.