Should I

I'd send unit to a pro and let them check everything, would not replace anything still within oem specs.

     There are a minimum of 26 aluminum electrolytics (that I know of) in your amp's critical circuitry.

     Thirty years is stretching it, regardless of that type capacitor's original build quality, or country of origin.

No, don't do it. If you want to tinker try a new amp. 

Caps should be replaced as they age, not just all of them especially in fully functional amp. Doing that is a lot cheaper and smarter. Recap jobs are too excessive and made for fools to believe that it’s worth it. Techies that want to make extra buck would gladly do that and even recommend it. Notably, many of those caps are STILL good so they can even re-use them on different equipment for free plus to what they've already charged for recap. Think about that and make conclusions.

Talk to Rowland, they service all their legacy products.  I had a 112 power amp serviced four years ago where they did the caps and also made some circuitry updates.  Including shipping it was less than $400.  There was s note saying that Jeff R. actually did the work.