Yep, I've done this job. The leak on ours was apparently from the quick-connect couplings, similar (but not identical) to the ones you have on the right of your compressor. They had to be taken apart (removed from the pipes) and resealed with new sealant, and the old sealant removed and blown out backwards with a bicicyle pump from the capillary tube, which it was blocking intermittently as the sealant was crumbling.
The refrigerant is R134a as is clearly marked on the compressor. You need:
- Can of R134a refrigerant gas
- Can tap valve
- Manifold gauge with hose set and connectors (Schrader)
- Rotary vane vacuum pump
- Vacuum pump oil
Once you've fixed the leak (probably also the connectors, just like on most boat fridges), you need to draw a deep vacuum for a few hours to boil out any moisture from the oil in the Danfoss compressor (else you get water freezing in the capillary and blocking it) and then refill with the new refrigerant. Top up slowly until you get the right amount, which you can tell as per these instructions:
http://coxeng.co.uk/heating-and-refrigeration/recharging-marine-refrigeration-systems/All of it was available from eBay, for a total of £140 although the R134a can be a bit tricky sometimes. If you can't get a can of pure R134a, you can buy one mixed with oil for a car air conditioning unit. Let it sit upright (valve at the top) for a while, at which point the refrigerant will come out and the heavier oil stay in the can, as you do not want to add this to your compressor, which already has its fill of polyolester oil inside.
Good luck! It's very satisfying when the fridge makes evaporation sounds again and gets cold!
