As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE UPON SELECTING GEAR UP AFTER TAKE OFF. MESSAGE PERSISTED FOR ABOUT 30 SECONDS. MESSAGE CLEARED ON ITS OWN AND GEAR FINALLY CAME UP ON ITS OWN. GEAR CAME DOWN NORMALLY DURING LANDING. (FLT 3584) FO:07/05/2018 CLOSED REMOVED AND REPLACED NLG SELECTOR VALVE IAW AMM. BLED NR 3 HYD SYS AND C/W GEAR SWINGS. GEAR OPS CHECK GOOD AND NO LEAKS NOTED AT THIS TIME IAW AMM.