My 2007, Volvo vnl, still a tandem, has a leak on the exhaust port of the traction control relay. After reading about it on the bendix page, it's internals are the same as the r12, r14 non abs relay which has a rebuild kit. Has anyone rebuild this relay valve? Any recommendation? It's a lot of work to replace it since I would have to disconnect cut the brake lines since they don't have swivel fittings on the valve assembly and the abs modulator relays are connected to the traction relay with threaded pipe.