a new 12" x 36" light colored cabinet door.
The dealer said - not available from the manufacturer.
Another place you may want to check is a rv salvage yard. Did a search and several came up they may have just what you need.
Another route could be, (if all else fails)---if you have or know of a local that does cabinet work, you could ask him if he would be interested in making you one to match what your ruined.
if you can send me a picture of your door I can take a look and see if I can help. My email address is tabrown2001@gmail.com. Happy to help if I can.
One suggestion would be to contact Ickes RV Surplus Supplies Inc. It is really hard to tell what they do have on hand, but have been anxious to assist in the past.