Congratulations on your Newmar many safe travels ahead.
Here is a
Brochure and
Owners Guide for you.
Below in my signature are links to many more items for your coach.
As Mike mention drill some holes in bottom of door than reseal, first time ever heard of your problem and why water would stay in door.
You may want to press the bottom of door channel and se if it compressors doors I have are not hallow maybe they now have space but insulation board was always solid foam insulation board.
Make sure lock is not loose to allow in water.