Hola. Yes. For that problem, the most common thing is the PSU board. Not a big deal, easy to change. In less than half of a hour you are done. If you want to confirm it, swap the boards, and listen. All what you have to do, first is unplug from the wall the main AC power cord, or detach it from the speaker. Remove the screws that are securing the back plate, and following the cables of the AC female connector, they will go direct to this PSU board. Look and do a drawing of the cables that are secured at the board, and that's it. Put back the cables as the drawing. Also, Martin Logan service department will send to you a procedure to do this, step by step. It is a clever idea to write to them regarding this issue.
Happy listening!