I think I can help you with a piece of electric tape! Basically when you take the unit apart the first piece you take off to get to the motherboard (battery housing, L and R trigger housing) is the problem. There are two ribbon connectors on this piece for the L and R triggers. Well the R trigger is the problem. The ribbon connector comes in contact with the metal shield that it site near (bottom side of where the battery sits). Anyway you can see nintendo puts a little sticky rubber thing so the wire doesnt come into contact with the metal. Well sometimes this isnt enough and the ribbon connector still touches that metal shield. Simply add more electric tape to the metal so the ribbon connector doesnt touch it. I hope this clarifies it for you. If you need further assistance feel free to contact me b_hayes820@yahoo.com