My 2016 Vegas had the same erosion of finish around the mirror bolt covers, which I noticed just before the 1 year warranty expired. Thor sent me replacement mirrors under warranty, that I installed myself.
About a year later, I see that the "cancer" is recurring. It's corrosion, not rust. May just overspray those spots with a chrome rattle can. It's a band aid, but I won't be buying new mirrors.
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