Argent, have you tried swapping the amps input cables left for right to see whether their are any sources issues? Ie now the left side is hotter than the right. Similiar experiment would be to swap left for right speaker leads (with source correctly connected) to isolate whether there are any "load" issues. This info will probably be useful if you talk with Bryston.
My 4B-ST runs Hot
4B-ST owners, does your amp run hot? After an hour or so of listening at moderate levels my amp is so hot on top that I can't keep my hand on it for long. I do not think I am pushing it that hard, but I might be wrong. My speakers are some small floorstanding PMCs (FB-1). Curious if anyone thinks this is normal or might be a problem?