Steve et. al., for the FAQ if you'd like, I just checked my power stage and found the thermal paste was completely gone and took a few pictures of where it was and what the back looked like. Mike - this probably saved me from an unplanned stop on the shoulder of a busy highway.

The power stage on a 940 is on the fender to the right of the air cleaner. You need to disconnect the AMM and remove the air filter cover to gain access to the power stage (the power stage is in the center of the photo below).



My thermal paste was completely gone (photo shows the heat sink for the power stage where the thermal paste goes).



After cleaning the contact areas on the power stage and its mounting plate, I applied a thin bead of thermal paste (~$1.50 online) in a z formation on the heat sink. Then, I pressed the power stage back on its mount and I pulled it back off to make sure the paste spread to cover the entire contact area and added a few drops where it didn't cover. Finally, I re-mounted. A little bit of thermal paste goes a long way and you don't want to have the stuff oozing out of every size when you screw it back down.