Have owned many pairs of Snells over the years.
Before removing the woofers, you may want to remove the tweeters and see if they are dead or not. if dead, no need to remove the woofers. Just replace the tweeters, if you can find a pair. Pretty hard to find these days.
The woofers are mounted with a tar like material to the front baffle. Don't pry on the outer edge of the woofer basket, or you'll just chip up the baffle face edge. Need to get a small screw driver and press through the mounting holes to gently pry woofer out. will take some time so dont rush it.
as for the caps, there is probably a mix of electrolytics with film bypasses. If the electrolytics are dried out, then may consider replacing them, but and a big but, be careful since you will screw up the tonal balance of the speaker if you go too far. Each Snell used to have the cross over hand tweeked to get it to match a master reference pair.