As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2825 EWR FLIGHT CREW REPORTED THAT DURING CLIMBING OUT OF EWR THEY HEARD A SOUND LIKE GEAR WAS STILL DOWN WITH GEAR LEVER UP AND GEAR INDICATION SHOWING UP POSITION. CREW RECYCLE GEAR TWICE AT AIR SPEED UNDER 200 KT. NOISE ONLY SLIGHTLY CHANGED WHEN GEAR WENT UP. FLIGHT CREW AIR RETURNED TO EWR UNEVENTFULLY. EWR MX R&R NLG SEQUENCE VALVE. R&R NLG RT DOOR AND THIRD UPPER LOCK BOX PROXIMITY SW. EWR MX PREFORMED LEAK AND OPS CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.