Ok everyone, Thank you for all the replies. It is much appreciated. I know that anyone else that has this problem is not pleased but, I am at least glad we are not the only ones experiencing this.
At someone's suggestion, I did open a Service Ticket. I heard from Mike in less than 24 hours. He said the door would need to be replaced. I responded by stating, "$$$$". Mike responded by stating that some people have covered the cracks with state park stickers. I think we'll go with white duck tape until we cannot stand it anymore or it gets much worse.
We are the original owners of #224. Our window did not have clips. We changed our window in 2018. [the cracks have only recently appeared] In early 2018, there had been many Forum posts about alternate windows. One was the one that togun2 referenced & another is the one we used. I really like it.
Again, ty
Gwenne - of Steve & Gwenne