@fiesta75 , I brought it to local audio shop and they told me it is the IC processor.
@russ69 , according to the audio shop, needs two ICs, not sure if they are custom or not, and trying to find it somehow :)
350-770502, VERSION 23, MAIN BD U5, NO 390S, (C)HSG
355-775266 MARK LEVINSON
@joenies , thanks for the info, I will try to contact them.