The original exhaust system in the 96 Mainship 350 / Caterpillar engine allowed water to back up into the exhaust system and damage the turbo system. I believe Mainship warrantied the problem and sent a new exhaust riser to be installed. Our Riser recently broke at the welded seam and appears to be past the point of repair. Does anyone know if that was a standard part that can be ordered or a part that needs to be fabricated. Any recommendations?