The faders on the 1280 console are one of its most fragile electro/mechanical components, considering the amount of use they get and the fact that the potentiometer body has an open slot that invites all sorts of dust and moisture.
You can see pictures of the condition of some corroded faders and the wear and tear they accumulate with time here. "Cleaning Faders"
The original faders installed in the 1280 are:
Manufacture: ALPS (Japan)
Part No: 79G-10kΩA
Resistance: 10kohms
Taper: Audio
Dimensions: