I hope no one confuses RCAV8TOR's term "silicone type grease" with RTV silicone [Room Temperature Vulcanizing, AKA 'blue glue'] and makes a lot of work and wifs [weird intermittent failures], I am pretty sure he means "Dielectric Grease" [sold as "spark plug boot grease"], and if he didn't (I would be surprised), I would like to insist that is what should be used.
p22 is basically the fact that, in this truck, there is also a signal from the FNR switch during Neutral, and the dash Panel [P code] is not seeing a signal from either F, R, or N for/in a pretty short/quick period of time.
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