I'm with Wolf_garcia--I too like to do those things and even replace low- to medium-quality parts with better ones. I have 5As and have replaced a few parts in their x-overs, but physically the boards are jammed with parts. Here's a pic with original parts.
http://i89.photobucket.com/albums/k220/jeffreybehr/0%20Vandersteen%205as/Boardtop1_1280w.jpg
Here's a pic with the 3 bypass caps replaced.
http://i89.photobucket.com/albums/k220/jeffreybehr/0%20Vandersteen%205as/10Jun2011_1uFPltnmoverall_1280w.jpg
I've upgraded parts in my new VCC-1 centerchannel speaker; that required removing the bottom plate, removing staples, and pulling the sock up to remove the driver and x-over.
It can be done, but it requires patience and a bit of work.
.
http://i89.photobucket.com/albums/k220/jeffreybehr/0%20Vandersteen%205as/Boardtop1_1280w.jpg
Here's a pic with the 3 bypass caps replaced.
http://i89.photobucket.com/albums/k220/jeffreybehr/0%20Vandersteen%205as/10Jun2011_1uFPltnmoverall_1280w.jpg
I've upgraded parts in my new VCC-1 centerchannel speaker; that required removing the bottom plate, removing staples, and pulling the sock up to remove the driver and x-over.
It can be done, but it requires patience and a bit of work.
.