repairs for Martin Logan CLS II

i have a pair of martin logan cls ii pushed by audio research sp-14 preamp and cl-60 power amp. the right speaker seems to have malfunctioned/blown. it is lacking in volume and power compared to the left speaker and also produces a hissing noise similar to that of a blown speaker cone.

i'd like to know if anyone has experienced this and how much will it cost to get repairs done. where should i go to get it done and if there are other options such as purchasing replacement panels (how much?) and replace it myself.

thanks for all your help and comments.