What was found
REPEAT WRITE UP AFTER TAKOFF AFTER GEAR RETRACTION A RED CAS MESSAGE NOSE GEAR OPEN GEAR DISAGREE DISPLAYED. WE COMPLETED THE REQUIRED CHECKLISTS AND RETURNED TO A NORMAL LANDING AND TAXI TO PARKING CORRECTIVE ACTION: REMOVED NLG UPLOCK ACTUATOR. TECH AP3636666 OKAY TO INSTALL REPLACEMENT UPLOCK ACTUATOR. RII AP3399800 / INSTALLED REPAIRED UPLOCK ACTUATOR ASSY. TECH AP3636666 VERIFIED INSTALLATION PER CL650 AMM 32-32-04-400-801 RII AP 3399800- / VERIFIED RIGGING PER CL650 AMM 32-32-04-400-801 RII AP 3399800 PERFORMED OPERATIONAL TEST OF NLG UPLOCK ACTUATOR ASSY PER CL650 AMM 32-32-04-400-801. NO DEFECTS NOTED. OPS CHECK GOOD. TECH AP3636666 RII AP 3399800