My parents are on their third MTC screen on their 2012 Wakesetter. Luckily the first two were under warranty, had to bite the bullet from the dealer on the third however. We explored all options, seems like purchasing from dealer is the only fix. They are meticulous with their boat, there is just nothing you can do about it. Had to wait 4 weeks for the third screen because they were on back order. I think that says a lot about how severe the issue is with these screens!
I feel bad for those with the new 12inch Wakesetter screens. Once those start going bad, I'm sure those will cost you your first born to replace. Malibu dealer at the boat show was telling everyone they have had no complaints on the new Wakesetter screens thus far... makes sense since no one has had to replace one out of warranty yet!