I did do a quick peek earlier but will do so again. Also planned to start wiggling wires/connections to see if I can find a fault.

 

Here is the latest: Discovered the ground wires leading to the TCCM had a higher resistance reading than I expected (approx 20+ ohms). The service manual I downloaded showed a common ground called G207. This is located to the right of the gas pedal, straight down from the TCCM (pull carpet down and you will see it) It was slightly loose, and I believe the root cause of my issues. Time will tell for sure.