Steve,
Its my understanding that on M-380's there are three different ways to access the front slide seal.
I know that on my coach, an '03 M-380, its very simple.
After unclipping the awning I use the F-3 button to move the slide in, and the F-4 button to move the slide back out. On other coaches it may be necessary to unbolt the cylinders to slide the slide in. I have no idea which coaches require unbolting. I just know for sure about my coach. I just did it this afternoon!
