As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR DID NOT RETRACT UNTIL 3RD TRY. FIRST 2 ATTEMPTS FROZEN IN DOWN POSITION. REMOVED UPPER AND LOWER BARREL ASSEMBLY FROM NOSE AND REPLACED WITH SERVICABLE UNIT FROM CESSNA AIRCRAFT COMPANY FAA CRS CNQR918C. GEAR OPERATIONAL CHECKS SATISFACTORY. ALL WORK WAS ACCOMPLISHED IAW CESSNA CITATION 750 COMPONENT MAINTENANCE MANUAL CHAPTER 32-20-02 AND CESSNA CITATION 750 MAINTENANCE MANUAL CHAPTER 32-30-00.