As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE-OFF AT APPROXIMATELY 145 KTS, GEAR DISAGREE MESSAGE ILLUMINATED, NOSE GEAR HAD RED HASH MARKS AND AFTER 10 SECONDS NOSE GEAR RETRACTED. AIRCRAFT RETURNED AND LANDED SAFELY. INSPECTED AIRCRAFT AND FOUND NOSE STRUT DID NOT FULLY EXTEND DURING JACKING OF AIRCRAFT. FOUND NOSE STRUT IMPROPERLY SERVICED. RESERVICED NOSE STRUT.