Replaced mine on my 3200 about 4 weeks ago! It wasn't too hard to deconstruct the steps. I ended up finding a 6 year old, still new in the box MarineAir unit (VCD16K) so didn't have to mess with changing the plumbing, wiring or ducting. I figure I am good for another 15 years!
Now, what to do about the frig. It decided to die! I got the old unit out (barely fit through the companion-way door! But it did!) but now have to decide what to replace it with.
I seem to have real refrigeration problems! Icemaker last year, AC this year, now the frig. The good thing is - not much left to replace!