There are some over at audiokarma, but they have long waiting list. Skylab have a guy he deals with I think. There are a coupe of local people I know, but it's not a job they are willing to take on without paying close to a grand to do it.
My guy is a Pioneer guy...he is great but I'm not sure where he would do Sansui or not. He did an absolutely killer job on my SX-1980.
It's so silly to think that just because a vintage receiver hasn't been completely recapped and torn down that it is inferior to one that has. If you get them serviced by a shop that knows what they are doing and gets everything back into spec you are just as well sometimes even better off then if you had paid for a full recap. Most of the caps aren't still in production so they have to get something close which isn't always so close!
This isn't really a good full picture. Electrolytic caps WILL fail. It's not a matter of if, it's a matter of when. It's true, if you want to have a tech REMOVE every single electrolytic cap from the circuit board, test it, and then solder it back in if it tests OK, you could, but why? They will still eventually fail, and before they do, they will go out of spec and stop working correctly.
Not only that, but many of these units had other design issues that are known and documented that need to be addressed. Examples are the problematic Dolby board of the Sansui "DB" units, and the power supply boards in the SX-1980. These need to be fixed or there WILL be trouble.
A complete recap is NOT about having it perform "better" than one that is not recapped - although it may well do just that. For me the complete recap and restore is about knowing that the unit in question will very likely last another 25-30 years.
I have stated my personal opinion here before however that recapping is probably only worth paying someone to do on higher end units. It's not really worth it on less expensive ones - better to just enjoy those while they last, and then if they fail, buy another, as they are not so expensive. Or of course for someone who likes doing that sort of work themselves and knows how, then it may make sense to do a less expensive unit.