I cleaned up the drive gear in the icemaker and put a little PTFE on it, turned up the water a bit and now we have ice. It's been running great for about a month. Apparently, the drive gears are prone to corrode when you leave the machine turned off with the door closed. No replacement required at this point.
I put a household water filter in front of the wet bar supply line. We're not drinking the water but we're using the ice to fill the cooler AND in drinks. No weird taste and no unintentional weight loss programs so far.
I will chalk this one up as that rare win for our boat budget.