Park switch - glitchy after rustproofing

Hi guys and gals,

2006 Tacoma was in the shop a few weeks back getting a Krown rust spray. Drove the truck fine for a day or so and now on occasion (not every time), it won't start in park. I thought first it was battery connections so cleaned them.

Then realized that I can start it in neutral perfectly fine.

Where is the switch to clean or spray out? I'm sure perhaps a connection just got loose or a dose of krown penetrated too deep and the connection got lost or loosened.

This is the V6.

Thanks!

 

similar location and configuration to this one.