you will most likely find the button is bad.
if you have a replacement from airstream you can basicly rip it out with a needlenose pliers and replace it with the new one. it snaps into place from the outside.
for a less destructive method you will need to remove the inner skin next to the door and push the button out from the inside.
before you try anything give the button a shot of wd 40 and see if it starts working again. it may just be slightly corroded.
you call them ferrets, i call them weasels.