Repair shop recommendations near Dublin, CA?
 

I have a number of things needed to be done on my 1991 420SEL (W126), and am looking for some shop recommendations in the area of Dublin, CA, or nearby San Ramon, or Danville.

I need some AC repair, due to leaks (I realize that Mercedes knowledge may not be needed for this, since the climate control electronics are working fine, but I am still wanting to establish a relationship with a good M-B shop)

Some other upcoming things include a possible replacement of valve stem seals, plus the usual ongoing maintenance things.

Thanks for any advice that anyone has.