You go outside and practice screaming. We'll play music while you're gone.
View post (Marshall fault - please help!)
View thread
The on thing I will say is of you're unsure, take it to an amp tech. Unless you're an expert don't try to fix it yourself, you could break it worse or electrocute yourself. If it has to be fixed, make sure you take it to a guy who knows what he's doing. It's worth it.