My local tech, who is great, and has been doing this over 30 years, says he will work on anything but a 70's Marantz. Just thought I'd mention this before you take it apart.
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I tried to post the URL of a guy who sells rebuild kits but the moderators deleted it. I've done the rebuild on a 2230 and it wasn't easy. There are lotsa boards and they're wired tightly together. There's about a hundred caps that need replacing, so you'll need yards of solder wick. A few of the transistors will probably need to go, so be sure you can substitute old for new. And new LEDs just dont have that inviting 70's blue glow, but you can still find OEM replacement lamps on eBay. Good luck.
I think I've already found the guy you're talking about. He sells rebuild kits, LED mods, and specific replacement transistors (among other things).
This seems like a project that will fill plenty of my time without costing me an arm and a leg. I'm trying to give myself something to do that will fill my need for tinkering without messing with any of my main gear.
That sounds like the guy. And yes, it will take you a while :) Be careful desoldering. Those old circuit boards are fragile--the circuit print will lift if you get in a hurry. You might also want to look on the web for the wiring diagram; it was very helpful in my case. Cell phone photos helped a lot, too. It took me about a month, an hour or two each evening, to finish, but the effort and its result were well worth the time.
I've already looked through that site and intend to take advantage of his resources. I've also found a guy who upgrades the preamp section, and there's a few other tweaks I'm going to try.
Thanks Calbrs03 and Nonoise for your interest and help. I may post this as a project over at audio circle once it truly gets underway.