I had to have all the hydraulic lines replaced in my 3670 RL due to severe leaks and burst lines. The low cost and low quality hoses from the factory were junk. The first line under Keystone warranty the rest by extended warranty. The lines were leaking internally and swelling up with orange size oil bubbles that burst. We also had the hydraulic pump unit replaced under Keystone warranty due to leaking. We camp almost every weekend year round much more than most. If you have the slick plastic coated lines keep an eye out at the pump for leaks and swelling. The rest of the lines are hidden from site. Look for oil stains underneath the camper at the seams of the underpinning material.
