Our DRV has cable operated slides, which sounds like yours does not. I can say IF your DRV is set up similar to our old 2011 Montana there is a false bottom under the bed, under the storage area there. Pull that up and you should find the metal apparatus for you hydraulic system. The ram is there and you should easily see if there indeed is a sheer pin and if it's intact. I can't remember if our old trailer had a pin or not but I did have to go in there, we had a loose fitting and we were loosing fluid and having trouble with the slide staying all the way in while in transit.
I hope this helps in some way.
Dan