Pucfink,
I agree fully with you.
My experience is similar with Cary Audio , where I sent my amp for replacement of caps, they did entire check , recommend several other items for replacement or upgrade , test run it for 48 hours . In the end I did spend considerable amount , but what I got back is a totally improved and a fantastic amp , much much better than my original one. I am happy I sent it to them and got all those improvements. What they charged , looked heavy when they sent estimate , but now I think it is trivial compared to the performance improvement I got.