Howdy and welcome to airforums.com, horse97
! Although, I note that you joined in '08 and this is your first post! Congratulations on leaving your lurker status, there's lots of good stuff to be learned here.
As your for your refer, this company RV Mobile
, sells new "guts" for old units. They also seem to have a wide assortment of parts, and explataions of what's going on when your refer won't cool.
I have never used them, nor do I know if your unit is available from them, but it's a start...! Find your model number, and have a look.