I recapped my A600 the other day, I would have offered to do yours (as a starting point, then maybe do the A4000 in future)
However, I bought enough capacitors to recap two A600's, then used half of them recapping a Sega Game Gear. :p
I had been doing electronics assembly for nearly 9 years, till someone decided to make me redundant.
So, now I've set up a little work area at home for repairing/modifying/building bits and pieces.

