Quoted from Phatchit:

When I shop out a pin it envoles the follwing
stripped the playfield and clean off the playfield with novice and depending on the playfield I also use a magic eraser(very carefully) with alcohol, new white rubbers,new coil sleeves,springs,and stops. all burnt out bulbs replaced,all the plastics cleaned, flame polish ramps and plastics, new balls ,polish wire form ramps with fine steelwool,new post sleeves ,adjust any switches that might be off adn end it with at least 3 coats of canuba wax. Im sure im missing something else but thats the jist of it. As stated above the phrase "Shopped out " means alot of different things to alot of people so just be sure to ask what was done. Hope this gives a little help to whats what.