You can get repairs and modifications at Sam Ash and a score of other places in the city. The fact is unless your guitar is something really special and unique, your probably better off investing in a new or used quality instrument.
Sam ash
I think Guitar Center has a better repair center. You can search online also. There are some local guitar techs that will setup your guitar for $50. It really depends on what you need. If you need a serious repair, you should weigh your options as to repair or replace
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