Good amp repair shop in L.A.?


Seems to be some good ones around the country but don't know of anyone working on highend electronics in Los Angeles. Any suggestions would be appreciated.
twopippis
Audio Specialist seems best with oldest type of equipment.
For anything else they don't seem to do in depth diagnosis/repair as I have personal experience with repair which was later inspected by manufacturer.

I referred a friend to Audio Specialist for the purchase of a 1970s vintage Kenwood intgrated amp. When I saw the amp at my friend's house after he brought it home, it clearly had not been cleaned, and the volume control was scratchy. This is something I expected would have been done, otherwise why purchase from a repair shop that sells vintage gear?