Hi RO members.. s'been a while, and today I come to ask.. why is my amp rattling? I have a Marshall TSL602 combo amp.. and when I play a bar chord (open or muted) on the 2nd Fret at standard tuning I hear something (metal sounding) in the top of my amp rattling/vibrating. This only happens on the 2nd fret - perhaps it's a particular frequency that my amp does not like..i don't know. Should I be worried? because I am! Could anyone suggest what this problem might be? I'm guessing I need to get this thing down to an authorised Marshall tech? HELP!