As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE ON TAKEOFF WHEN TRYING TO RETRACT THE GEAR. BOTH MAINS RETRACTED FULLY BUT THE NOSE GEAR STAYED DOWN. COMPLIED WITH QRH AND ALL GEAR INDICATED DOWN AND 3 GREEN. RETURNED TO FIELD. (FLT#4105) REMOVED AND REPLACED NLG SELECTOR VALVE IAW AMM. HYD SYS #3 BLEED IAW AMM. PERFORMED FUNCTIONAL TEST OF THE EXTENSION AND RETRACTION SYSTEM IAW AMM. OPS CHECK GOOD. NO LEAKS NOTED. NO GEAR DISAGREE MSG.