KLH audio system Model R3100

I do quite a bit of tv repairs. Customer bought in above amp and said it went dead during an electrical storm. It turns on, with no sound on speakers or headphones. Various input are also dead. Checked all voltages coming from the power supplies, they are present and seem to be ok. I can hear the speaker relay click when I switch from headphones to speakers. I am not too familiar with the newer type amps, is there a muting ckt. in there, I do not have the schematic. Any tips or suggestions will be appreciated. Anybody have a email address for KLH service? Tom