Thrustmaster T80 steering problem

[Silverhaze]

Hi i have several Thrustmaster T80 steering wheels.
The T80 wont steer, all the buttons work. All the wheels are working but not the steering part, some of them have parts broken some of them have nothing broken parts. But all the steers dont respond on steering. Maybe it's a common fault ? I checked the pot meter and it was working. But steering no response on pc. It has a small pcb board, is there anny replacement available? Think the circuit is the problem. Or the only way is to measure till i find the vaulty component?