As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF SELECTED GEAR UP, APPROXIMATELY 10 SECONDS LATER RECEIVED A GEAR DISAGREE WARNING WITH THE MAIN GEAR INDICATING UP AND THE NOSE WHEEL HAVING YELLOW CROSS HATCHING. RAN QRH, RETURNED FOR NORMAL LANDING. SERVICED NLG STRUT WITH MIL H5606 AND NITROGEN IAW 12-12-32. ADJUSTED PROXIMITY SWITCH. AIRCRAFT JACKED AND LANDING GEAR SWUNG SEVERAL TIMES. OPS CHECK GOOD.