My 2017 Discovery with 6,000 miles has developed a popping noise in the general area to the rear of the drivers seat and under the coach.  Fleetwood Service Center has ruled out the coach side having the problem and Freightliner says it is not the chassis after spending three hours retorking everything on the front end.  The pop comes upon breaking at slow speeds, from with a forward or reverse motion.  Seems like it is most evident when the coach body shifts weight at slow speed.  It has also popped when hitting a rough spot on the road.  No rhyme or reason.  Everyone is recommending I go to FCC in SC, but I was told there are no openings until September - I haven't tried to schedule - just talked to Customer Service.  Any ideas or suggestions will be appreciated.  By the way, if Freightliner can't find a problem that the warrant covers, they will charge charge you at the prevailing rate for the time they spend looking!