I haven't opened a pair of Sofias but I have worked on other Wilson where the driver terminals are soldered. The leads can be quite short and substantial, so desoldering/resoldering the drive units is not a trivial task. It needs a powerful iron and care not to put too much heat into the drive unit. It's a two person job to do it properly.
WILSON ORIGINAL SOPHIA'S
I have decided to purchase a very clean pair of original Sophia's. I have been able to audition them with my amp. The results were much to my liking. Very coherent from top to bottom and a significant improvement from my current speakers. At some point I will need to replace the diffraction pads (both top and bottom) which are available from Wilson (They have started to deteriorate from age). If anyone has done this on their own...I would like to know how cumbersome it was. There is a how to video from Wilson involving using denatured alcohol to dissolve them but I'm not really sure I want to tackle it that way. Any suggestions?