I've never seen a GC that does repair work in house. Most can't even do a proper setup in house. They, like most other music stores, outsource to a local shop that specializes in repairs. Ask who they use/suggest and check on them yourself.
GBT
True, I asked the Guitar Center in Little Rock, who did their repairs, and they send them to a local repairman, no in house, which kinda suprised me.
the guitar center near me actually does the repaurs a tech comes on tuesdays only. i doubt they could repair the finish though.
adam