Door Won’t Open

We have a 2005 Beaver Monterey and just came back from having our door handle and locks replaced at Beaver Motor Coach Sales. After only a handful of uses it is now not working and we can’t get into the motor home. The door wasn’t locked but it won’t open and the paddle handle is very loose. All windows are locked up. I searched online for a damage-free way of getting inside and could only find one old forum query from 2010 (posted by Rhyph) on the exact same issue. It can no longer be accessed through the forum however and the solution used was apparently sent in a PM. I suspect it may have something to do with opening the emergency window from the outside(?) All other suggestions involved drilling, locksmiths or removing the skylight and the poster commented that it was done both by themself and damage free.

Any suggestions? We are new to Class A’s and the forum. The emergency window is the bedroom horizontal slider with hinge on top, and inside has the slider latch and two red lever latches on either side.

Thanks,
CJ