Today I had to take my bike BACK to the shop because when I went out for my ride last Saturday morning the rear shifter wasn’t working. Inexplicably. Took the bike back and they fixed it up by replacing the housing for shifter cable. Not a big deal, but annoying, seeing as I just had a tune-up. And it’s quite likely they actually messed up the cable when they were re-wrapping my handlebars. So, definitely trying a new bike shop next time.