As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE NOSE GEAR WOULD NOT RETRACT. GOT GEAR DISAGREE WARNING MESSAGE. RAN THE QRH. STILL WOULD NOT RETRACT. RETURNED TO FIELD. (FLT#3756) FO: 07/10/2019 CLOSED REMOVED AND REPLACED NLG PRIORITY VALVE AND NLG SELECTOR VALVE IAW AMM. OPS AND LEAK CHECKS GOOD IAT AMM.