What was found
AFTER TAKEOFF, MLG DID NOT RETRACT. ONE RED "UNLOCK" LIGHT ILLUMINATED, FOLLOWED A FEW SECONDS LATER BY ONE RED "UNLOCK" & ONE GREEN NLG. RAN QRH, LOWERED MLG HANDLE, THREE GREEN LIGHTS. MLG HANDLE SOLENOID PREVENTED RETRACTION. SERVICED NLG STRUT & OLEO IAW MM 12-10-38. PERFORMED HYD SYS BLEEDIND PROCEDURE IAW MM 12-10-15. PERFORMED LANDING GEAR OPS CHECKS IAW MM 32-30-00, NO DEFECT NOTED.