I wish I had something concrete to offer but in lieu of that my first advice would be to talk to local cruisers or fishermen with boats that have refrigeration. Figuring that where you are might not have either of the above then looking for a refrigeration guy by asking at commercial businesses like grocery or butchers that use professionals. Not much help probably, sounds to me like any simple problems you solve on your own.
Bueno Suerto
Tom Evans
S V Tappan Zee