AR repair in SF bay area

Looking for recommendations for shops that can repair AR3a speakers. I know the pots are discontinuous.

You could try a pro sound rental company that rents out PA stuff for parties and DJs. I live in Santa Cruz and our local pro company Santa Cruz Sound actually had the proper rubber surrounds in stock to repair the woofers on my old Advent Loudspeakers. Many pro sound rental companies are constantly repairing their own and others' equipment. Worth a try, worked for me.
If you are devoted to these I would probably cast my net nationwide and ship them to someone who knows what they are doing. Check Audio circle or the classic loudspeaker pages. Shipping is probably only $150 anywhere by Fedex or UPS,
including boxing.
Well worth restoring. I wonder if anyone "upgrades" AR3a with high quality caps etc? Results?