You can buy replacement pitch sliders with and without the PCB.

I'd recommend replacing the PCB as well as the fader to be safe.
The VR302 pot on this board could have also failed you see

My 1210's are at least 15 years old, a few weeks back i decided to fit new a pair of new pitch sliders and re-calibrate them so they're have the 0% aligned. Also matched the pitch range so they are exactly the same at +/-10%

To calibrate them you just need a multimeter and fine tune a few pots

There is a seller on ebay with loads of brand new official Technics parts