Yep, phone Ben Lillie at ATC. I had my 100s upgraded when the new midrange surround and bass port came out, and a full recap. They even provided flight cases for transit. You should be able to get SL mid and bass drivers for yours, the new port, and possibly the new tweeter. And a recap is probably due.
wouldn't you need slightly different electronics / crossover, inside if you have different drivers, ie upgraded new,
as you can tell i have never owned a pair of active's
I had mine done a few years back (new SL drivers, amp pack recap and service and new midrange wave guides). ATC will quote you the list price but if you give Rick at Musiccraft a ring he might be able to give you a better price. I took the speakers down to the factory myself and had the factory tour while the work was carried out.
Nice, how do you like the updated speakers?