Unmapping/Deactivating a volume fader? (NI S4)

Unmapping/Deactivating a volume fader? (NI S4)

I’ve had some liquid damage to deck B’s volume fader and whenever the fader gets moved, it glitches and responds on screen as the fader moving wildly. Is there any way I can bypass the fader so that it does nothing and I can just use my mouse to control Deck B’s fader?