It clearly depends on which Guitar Center you go to. In my town, GC is the only source for any high-end or high quality guitar related product. Therefore, the staff there are very knowledgeable people and the techs are the second best in town. (lol - Baron Martin lives and works in ELP - always numero uno). I can see where in larger or more "music-centric" cities, the high zoot techs would not necessarily work for GC - but here, that's where all the professional and gigging musicians go. And the entire staff are not only well versed, but are working musicians themselves.

All the guitars in our high-end room are freshly stringed and tuned to pitch. That speaks to the quality of staff.

But GC nationwide is not the same store to store. So OP, your question cannot be answered (for your specific GC) except by trying out the repair people at GC yourself, or at least talking to some local musicians. This is something you really need to research locally.