As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR RETRACTION ON CLIMBOUT THE NOSE GEAR STARTED TO SHUTTER AND WAS FOLLOWED BY A GEAR DISAGREE WARNING MSG. AFTER RUNNING THE QRH, THE MESSAGE WENT OUT AND LANDED / TAXIED NORMALLY. RETURNED TO FIELD. (FLT 5490) CLOSED REMOVED AND REPLACED NLG SELECTOR VALVE IAW AMM. OPS AND LEAK CHECKS GOOD.