Logitech G25 FFB Problem

Hello everyone, i recently bought an used G25, i immediately replaced the encoder and noticed that one of the motors apparently broke.
The wheel calibrates perfectly and steers perfectly but i can feel no grass or any feedback at all other than the motor trying to put it back to its calibration.
I have another broken G25 in my house so i tried to switch up one of the motors but apparently as soon as i replaced it the calibration started messing around and the motor that i replaced stinked.
What do you guys think of this problem, any solutions? I'm pretty sure that one of the motor is broken but i don't know any places where to find a replacement.

Thanks for your time spent, i really need your help!
Have a good day.