Fellas, isn't there a special WD formulation for electrical contacts? This is the one I was referring to in my original post.
Unless there's physical damage to the resistive taper inside the pot, a slightly crackling pot is hardly a reason to send an amplifier in. Turnaround will take weeks and with the current state of affairs, postage might not be risk-free either.
Speaking of volume pot in the BHA-1, is it a Noble or an Alps? My amp's S/N is in the 300 range and it was among the first ones to have preamp outputs.