Sorry I did not see this until now. Seems as if you have a good bit of knowledge of Snell. If I were you and I decided to mess around with a Snell network I would replace every single capacitor you see with identical parts. If it is an electro 12uF at 5% go back with an electro at exactly the same value. If its a poly go back with the exact same cap, exactly the same. Resistors, if they are good I would not touch them. Inductors the same. Do not change the inductors. I would go so far as to try and find the same exact manufacturer of the parts I replaced but that is probably me being a bit paranoid. Snell put these speakers together with great care exactly matching a master set of the same speakers. They even counted in slight woofer and tweeter variations so, very important to re match those parts. As far as the pot goes just clean it with Deoxit brand cleaner/lubricant. I would not change the tweeter, oh no, no, no ! Your highs will almost defiantly clean up with just cleaning the pot.