Here's a source for $370.95, (regular $616.70). I know absolutely nothing about them or the part, which seems to have a few "Types". 
Caveat emptor and all that but send me 10% of the savings ;-)
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Cheers, Craig SN68 Sangaris, Tropic Isle Harbor, FL
Ooops, forgot to include the link- here 'tis:https://www.mauriprosailing.com/us/category/Lewmar-Winches-Electric-Components-Control-Boxes.html