It depends on what the servicing is. Two solutions to the problem are good. One is a simple replacement of the driver, I don't think you can fix a burnt voice coil as in truly blown drovers. The second could have been a rotted suround being replaced, this also is benign if done by a pro and in your case it probably was. I should have added a third possibility, the actual cones suffered damage. Onc again if done by a pro a reconing job could be quite benign.
The fact that both drivers had service is not unusual as the owner would have wanted to ensure equal sound coming from both speakers, I know I did that with my JM labs speakers I removed both tweeters but only one was damaged I uised the actual JM tweeters for that because a friend of mine is a speaker repair guy who had access to them.
The fact that both drivers had service is not unusual as the owner would have wanted to ensure equal sound coming from both speakers, I know I did that with my JM labs speakers I removed both tweeters but only one was damaged I uised the actual JM tweeters for that because a friend of mine is a speaker repair guy who had access to them.