A bike with disc brakes was recently given to me. The rear brake has a slight "scrape" against what I'm assuming is the pad. It's not a constant scrape; it happens in the same spot on the revolution, kind of like an un-trued rim would scrape against a brake pad. I'm assuming the disc has a slight warp in it.
So, my question is, can this be easily repaired, or is it more a problem for my LBS? I've never owned or worked on disc brakes before.