I noticed that my emergency flashers were only flashing the right directional. Looking at the wiring diagram made it obvious that the problem was at the switch. I got underneath the dash in an attempt to push/remove the switch up through the dash but no joy.
I did manage to wiggle the connections so both directionals are now flashing again, but the question has been raised and needs an answer for future efforts to clean/fix/swap out switches.
What is the secret sauce for removing these switches from the dash?