I have had one go bad too. Marshal Brass brand at the time. It was on our prior camper and lasted about 2 years and it would no longer regulate correctly. The set pressure would go low and trying to adjust it, it would not stay stable, so out it went. That said, we changed campers since. This current camper has the original regulator from when the TT was built in Nov 2003 and still going strong.
These RV regulators are made cheap. Most are non repairable. They are not made like a LP regulator used on a home that can last decades, and also cost a lot more. Some RV regulators have a short life, others a long time.
In my book, 9 months is not right and should be under warranty. Jayco I thought had a 2 year warranty but do not know what it all entails. You did not say where it was leaking. If it was leaking out the vent, odds are high it's a pin hole of sorts in the diaphragm. I had a RV stove regulator leak like that. That was what ever brand Atwood uses on the stove tops.
As was stated, it is good idea to have the set pressure checked. They will be set out of the box, but one never knows... Any gas service person can check it and do a pressure drop leak test and regulator lock up test at the same time.
Good luck.
John
PS. Odds are high the brass fittings in the end will not come out without damage. Whatever thread sealant they use really bonds the brass to the aluminum. And as the other poster stated, most new regulators come with new fitting in them if you select the type with the inverted flares. They sell then straight NPT and with the brass flare fittings.
