Guild Guitar D25

I have a Guild D25 that I traded for a parrot back in 1980. I am primarily a bass player, and the thing has sat around in the case for years. It sounds great, but is an animal to play, I think it needs some work to bring it back into shape. I have been playing it a lot more as of late and wanted to purchase something like a Martin. I have not been able to pull the trigger on a new guitar and I think that I have not found one that has the same resonance. After reading all of the comments here, I think it would behoove me to have some repair work done instead. I am sitting on something quite good here based on your input. Thank you much,

Rob