Wow, We have 351DS, Took it in for front end work. Had a bent axle from the factory. It took a while to get it fixed. FORD could not fix it. Had to take to a place that specialized in big rigs/motorhomes. Everything was eventually fixed under warranty. Document everything, take pictures if necessary. Keep all paperwork filed neatly. Unfortunately I have to agree with SivlerbackMel and the lawyering. There's nothing wrong with talking to a lawyer to find out what your options are, sooner than later. This is not frivolous, it's getting advice, "just in case." We had to get one a couple of years ago with something similar, with no experience with lawyers...long story short...we won. Lots of documentation from the first day. Get names as well. Good Luck. FR did us right though, hopefully it won't come to litigation. Good Luck!
2015 Georgetown Forest River 351DS MH
2008 Keystone Cougar 293SAB 5th Wheel
2007 Jay Flight 30.5RLS 5th Wheel
2006 Jay Flight 29BHS TT