We all need good bass repair people...whether for routine maintenance or to fix a problem.
For Upright, there is nobetter than Jeff Bollbach (http://www.jeffbollbach.com/). He is fair, knowledgeable, and AMAZING craftsman and a REALLy great guy.
For electric, I use Ronnie "Stringz" Torina (firstname.lastname@example.org). He is AMAZING....you can see Stringz do his majic in my Kahler Video.
Feel free to contact these guys..tell them I sent you....