Name: PCB ASSY RECEIVER
Part #: 12414207
Price: $9.49
This is from
CJ's XMods FAQ
Just go to your local Radio Shack and order it there, or call 1-800-THE-SHACK.
You will have to resolder 4 wires on the new PCB, it might be easier to get a new resistor and resolder it (or have somebody else do it for you).