I have a flaky second channel on my GT3b. It works to a point but the reverse keeps drifting or stops working all together. Seems to be something to do with the soldering of the throttle Potentiometer and the resistor that bridges two of the three connectors.

When I give the solder a dab with the iron it behaves for a few hours of use before it starts to stray and neutral moves.

Happened after the 30 day store replacement warranty and two extra recievers so I cut my losses and bought a Futaba. Would like to find a proper fix someday so I can have a spare car for friends to play with.