As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. GEAR HANDLE WAS LOCKED IN THE DOWN POSITION AND WOULD NOT MOVE. TROUBLESHOT TO NLG STRUT LEAKING AND UNDERSERVICE NOT PROVIDING FULL EXTENSION OF STRUT. DISASSEMBLED, INSPECTED STRUT. INSTALLED NEW SEALS AND SERVICED IAW COMPONENT MM 32-20-01. PERFORMED OPS CHECK OF LANDING GEAR. ALL OPS CHECKS GOOD. (MLG SEAL KIT CPO680-32-2)