Quoted from Patofnaud:I don't know if there is a thread for it. But basically you swap the TIP42/Resistor in the Lamp Column section-> IFR9Z34N MOSFET/Jumper.
Reason being is that the big cement resistor tosses off a crap ton of heat and by removing 8 of them you drop internal head temperature dramatically.
I do the mod to all my Williams 6/7 driver boards. I've never done it to Sys 11's as I have not seen any data on temperature drop. In the System 6/7 machines is pretty dramatic IRC. And but lower temp, you save baking the translight/backglass and caps, ect,,,,..
Thanks for sharing and I look forward to trying this upgrade.
Peekskill, NY
Vancouver, BC
