As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF WHEN SELECTING GEAR UP, GEAR DISAGREE WARNING APPEARED. NOSE GEAR INDICATED YELLOW X WHILE MAIN GEAR WERE UP. RAN QRH FOR GEAR DISAGREE. MAN EXTENSION WAS PERFORMED, ALL 3 GEAR DOWN ALL LOCKED. (FLT#3528) CLOSED SERVICED THE NOSE GEAR STRUT IAW AMM. ALL OPS AND LEAK CHECKS ARE GOOD. NOSE GEAR CENTERS ITSELF ONCE IN THE AIR AND CYCLES UP AND DOWN SMOOTHLY.