Did you isolate the issue to the right channel backplate? To verify that it is the backplate and not the panel you will need to swap the right channel backplate with the left one. If you experience the same problems on the left channel after swapping back plates, then you know that the problem is your right channel backplate. You can send pictures to SL with a description of the problem. If SL can identify the faulty component, they should be able to ship you the replacement part so you don’t have to send the backplate back to SL.