Simply Speakers will either sell you a DIY kit or you can remove the drivers and send them in. These guys are very good and reasonably priced.
Go with Bill Legall of Millersound, as Rodman99999 suggested. You can call him at (215) 412-7700.
Some folks try to refoam speakers themselves. Some folks also try to cut their own hair. Since drivers are like tires on a car, where the rubber meets the road and where the audio signal is converted into sound, I consider that a foolish endeavor. Considering the low cost Bill charges, it's a simple decision.