It was removed for the winter, so I replaced the bearings, o-ring and neoprene gaskets. I also bought the Silentwind replacement blades, which are quieter (and much more expensive) than the stock blades. Seems to be running well so far, just need some more windy days to break down the grease in the new bearings.
Update: After sailing to New Bedford and back, the bearings are running free. And the new blades are a lot quieter than the stock ones, the purchase was worth it.