Guitarnut

I know it's been along time since this post but I'm in need of some clarification on this. I want to discharge my BC30 in order to do the MV mod but I need to be sure I'm discharging properly. So the R that Andyroid is referring to would be R4 coming off of pin 1? ...see attachment. Once the above step has been taken, how can I verify that the caps are indeed drained? Meter from the + side of the cap to ground? Thanks, Mark