As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4320 FROM DTW THE CREW RECEIVED A NOSE DOOR OPEN WARNING WITH GEAR DISAGREE WARNING. AN AIR RETURN BACK TO DTW WAS PERFORMED FOR THESE WARNINGS. PERFORMED NOSE GEAR QRH PROCEDURE AND BOTH WARNINGS CLEARED. WEATHER PERMITTED DEFERRAL AND DTW WILL PULL PSECU CODES AND DEFERRED GEAR. CONTINUED TROUBLESHOOTING NOSE LANDING GEAR NLG PRIORITY. REMOVED AND REPLACED NLG PRIORITY VALVE IAW AMM 32-32-15. OPS CHECKS GOOD.