Freezer (Naphill HP14)

I have a Hotpoint Ice Diamond type 134A under counter freezer which has been used in my garage for a long time, it still freezes OK but I think the insulation on top has got wet as the top ices over. If someone has the same model with a broken compressor or other fault and also mechanical skills enough to swap bits maybe they could do a bit of extreme recycling. I don't think a photo is needed.