A series of tests you can perform on your instrument, to identify problems. This is the place to begin if you don't know exactly what is wrong with your instrument. This should be useful for acoustic guitars, electric guitars, basses, mandolins, etc.
If you're having a specific problem with an acoustic guitar, take a look at this reference, to see if you can remedy the problem yourself, or whether you'll have to get someone else to do the work for you.
Info here relates specifically to problems that occur with electric guitars, including fret, neck, and other issues. Includes a section on wiring, and other guitar modifications.
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