Nikos, If they put it in the stand and actually checked everything, true, shifting, braking, chain wear, then test rode it, I would believe them. A bike can go a long time with minimal maintenance. With 2000 miles I would be inclined to disasemble any non cartridge bearings(hubs) and clean and regrease them, maybe changing the balls while you are in there. You don't need to, but it is cheap insurance.
Koolstop salmon pads are for wet weather, so they are probably more abrasive and will create more dust. I am just conjecturing. They do make them for road, in cartridge form at least.
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I am in the woods and I have gone crazy.