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Post 2 of 5. Getting to the shifter assembly was a pain in the butt.

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Post 3 of 5. Debugging time. After some inspection and probing it looked like the bottom switch was not reliably being pressed when the shifter was in park. I could have bent the arm of the switch up but I opted to just replace the switch while I had the opportunity.

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Post 4 of 5. The new switch fixed the issue. The part number is OMRON SS-01GL13-AQ6 and it’s less than $2.