Hi Grateful (as in Dead?)...yes there was a slight improvement in the highs. I think they are a little cleaner. Cymbols sound more like brass, bells have more clarity, upper register piano is clear without any glassiness.
The technician that worked on them is a real tinkerer. He suggested the upgraded caps -- I think he put in Auricaps, but I can't be sure.
I got the idea about separating the +/- input wires from a thread I posted over on Audio Asylum on my broken binding posts.
Dave