miltnme (Jonathan) - I'm currently using Tony at Autohaus (Los Gatos or Campbell... on Winchester between San Tomas and Los Gatos). Tony's the only one that knows the 113's in that shop.
I had used a long-time MB only shop (Hans Nissen) in Santa-Clara, then they moved to Campbell, then finally went out of business about a year after they redid all my mechanicals. This MB shop and it's mechanics had serviced the car since '69 exclusively. For my money they were the best in NorCal.
I then went to another MB mechanic in Campbell.... also turned out to be extremely knowledgable about the 113's details in mechanical/electrical issues... trained by MB in Austria for several years in the 113's era. Alas, he moved his shop to Roseville after I used him 1x.... too far for semi-routine items for me to travel... so.....
... I've used Tony 2x so far.... but patience is the key with him... I'm adamant about doing it right... no short-cuts, no bailing wire or ad-hoc stuff.
That's for mechanicals/electrical. I also use a restorer (can't name him publically.... sorry) for some things... he has a mechanic he uses for the engines on his restorations (300SL's, Roadsters, Gullwings, other MB classics pre'72 to '30's or so ), but can't use him for most mechanical stuff unless there's some idle time available... but the restorer's mechanic costs $$$.
If it's about total engine (short or long block), I recommend Metric Motors in LA... look them up on the web. Have a local MB shop remove the engine, hold peripherals, and ship your block (and head) for a rebuild).
I also do some work myself when my time & winter permits --- winter time even in CA is my 250SL's garage time except about 1x/month for a 100 miles or so just to keep things in tune.... but I only get to occupy 1/2 my garage for the 250SL, so I have to limit either time or extent of my own working on it. Generally restoration work, remove, restore or replace, re-install.
There are far more excellent MB mechanics shops for the 113's in the bay area north of SJ, so if you're north of SJ, you'ed be better off I think finding one nearer your location. .... Tony (at Autohaus) is very good properly motivated (read $$), but there are probably some better north of SJ somewhere. If you're in the Southbay, South of SJ, I'd stay clear of any so called MB shops south of SJ... I won't use names.
pbsmith on this forum keeps a list of local sources in bay area on a spreadsheet. He'll send you a copy... I'll follow up on this note with his alias on this forum so you can contact him.
Longtooth
67 250SL US #113-043-10-002163
'02 SL500 Sport