There are a number of threads on this. The search function is your friend here.
Unfortunately, the term "shopped" is subjective. it should mean that all rubbers have been replaced, the playfield has been cleaned and waxed, all blown bulbs have been replaced, any broken components have been replaced, etc.
But what you usually end up with is a playfield that has been cleaned in the open areas, bulbs that are easy to get to have been replaced and the glass has been cleaned with windex...