I have a 2015 Excursion 33D.  A horrible, horrible loud squeak has started coming from the entry door when the coach is  being driven.  This is not simply an annoying squeak,  It is a LOUD, LOUD squeak.  The mother of all squeaks.  When the weather is cool and damp it is at its loudest.  It seems to increase when I turn left.  It doesn't seem to matter if the road is smooth or rough.  It often stops in warm dry weather.  Two different service techs worked on the lock mechanism but could not fix the problem.  I talked to a Fleetwood Customer Service Rep who said it sounded like a shrinking and expansion problem possible involving Styrofoam. However, he knew of no fix.    Has any one else experienced this?  Any suggestions or thoughts?  Thanks in advance.