Check the engine
first just to rule
out an engine-driven compressor. If it's not there, I would probably try to follow either the wires from the breaker panel or the tubing from the reefer. I know that both of these things can be difficult to nearly impossible, but there's really no option. Like Sailmonkey & Vasco said, this is probably not a factory installation
. The bright side of that is that someone had to run the wires and tubes after the deck
was joined to the hull
. If they could do it, you should be able to get at the parts as well.
As far as the stove goes, you might post a picture of it here and someone might be able to either identify it outright or at least give you an idea of where to start. On my stove, I found an ID plate under the hinged stovetop. Yours might be there or maybe on the back (flashlight, mirror, yoga required).
Are there no Catalina user groups? I get a wealth of information and ideas from my fellow Westsailors on the Westsail Owners' Association website. Catalina owners must have something similar.