Steve,
Welcome to Beoworld !
The woofers in the RL35 have rubber surrounds and therefore don't suffer from foam
rot but it's very common to see cracked solder joints on the crossover filter boards.
It's a fairly easy fix.
Worth grabbing a capacitor kit and replace the lot while in there.
Mogens, I agree with Chris and Friedmett. I can also help you with the
refoam'ing if you need and capacitor kits exists for both types.
Martin