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Microair makes them but have to buy through dealer. I used Tropicalmarine in Ft Lauderdale. Guy named Howard had best price and seemed to know what he was talking about. Wild variation on pricing – and none of it good. The installation process is some sort of hell. Converters proud of hiding the PLM boxes in the most difficult to access places imaginable. That is the reason I am moving all mine to first bay curbside. Getting too old to fold into a pretzel and then work.
BTW: tip on Tropicalmarine came from ETLC. Those guys are great. I’m one of their biggest fans.
FYI: there is a company in PA called Flight Systems, Inc that can test and possibly rebuild those circuit boards.
Told you more than you wanted to know!
Mike