Originally Posted by Campag4life

Lets say your cable, shifter and parts are in good shape.

So it starts with position of the FD. The bottom of the cage should be no higher than a nickel width off the big ring when lined up. Easiest to set up a FD with the chain and cable off.
If your shop has played around with the limit screws but haven't touched the position of the FD, that is where I would start.