Q3 = IRLU024N
R66 = 33ohm 1watt
Future electronics has the mosfet for $0.48
http://www.futureelectronics.com/en/...:True,Nea:True
These controllers have clad circuit boards meaning they have solder traces sandwiched between the top and bottom layers. This can make these really hard to repair without a schematic. I have a 1206sx that I need the some resistor values for, hopefully someone will help me as I have helped you. I also have these parts if you want me to send them to you!
What caused the failure? You likely have some related components failed as well. Check the components I circled in the photo. Once again a schematic would really help track what caused these components to fail. It would only take a few more minutes to go ahead and check all of the transistors and diodes on both boards(highly recommended).