Deb is right about the housing issue, although some would believe that cables rubbing on each other cause more friction. Either way, it is not something new, and although I believe most mechanics do not run cables in this manner, some still do. Did you have new cables/housing installed when the bike was serviced? If so, perhaps the issue is that something has stretched or housing has moved a tad bit. Either way, I would suggest let your LBS adjust shifting... there's nothing more frustrating than a nice bike that doesn't shift.