Mission Speaker Repair in Minnesota

Hello! I have a pair of Mission 765 speakers, and the crossovers are in need of repair. I lose sound at times when the binding posts are moved slightly. It is bad enough now that I have to move them just to get any sound at all from one of the speakers. In addition to a simple repair, it would be nice to update the components in the crossovers (capacitors, etc), since they are 30 yrs old. Are there any reputable shops in Minnesota that I could trust to perform this work?

Thank you,
T.J.