What was found
NOSE GEAR FAILED TO RETRACT IN NORMAL SEQUENCE UPON SELECTING GEAR -UP AFTER TAKEOFF. CAS MSG APPEARED. APPROX 30SEC LATER, WITH NO ADDITIONAL INPUT, NOSE GEAR RETRACTED AND NORMAL GEAR -UP ICONS DISPLAYED. GEAR DEPLOYED NORMALLY TO 3GREEN UPON SELECTING GEAR DOWN. DURING CHECK OF RETURN CHECK VALVE, TECHS FOUND CHECK VALVE TEE FAILED INTERNALLY. R & R CHECK VALVE. OPS CHECKED GOOD. SWUNG GEAR 15 TIMES & EACH CYCLE WAS 8 SECS TO FULL RETRACT, AROUND 30 SECS TO WHITE -UP-. WITHIN LIMITS, BLED HYD SYS & RESERVICED TO PROPER LEVEL. ENSURED NO CASS MESSAGES DURING ALL OPS CHKS.