Randy,
When I cut out my panel, I used a razor knife and cut the panel out, all the way to the edges where it meets the stiles.
To re-attach the panel, I glued 1x2 wood pieces as cleats at the top center, bottom center, left and right center. Then I used screws to screw the panel to the wood cleats. I used small cove molding to trim out the cut and hide my imperfections.
In this manner, I still had quick access to the "behind the panel" area, should I ever need it and making that access didn't looks unsightly.
tboy,
My guess is that the bedroom remote relay was bad and Lippert didn't want you replacing a relay or maybe the board is a multichannel relay board and replacing it all was the only way to go.
Can you give Randy more detail on how you gained large enough access to the board and what was required of you to replace the board?