Thanks for the notes on this.? I have had a number of issues with the switched attenuators, particularly in HP8753D, E, and ES units.? In my experience they're bad on about 20-30% of the units which I have come across.? They use the 33321Q.? I have had luck with these just opening them up and cleaning the contacts with alcohol, but I like your Deoxit Gold idea as a protection once they're cleaned up.
