UPdates: Requested a return for the replacement valve body as it's the wrong one, As per RRPhil.

To do:
remove the new valve body from the transmission, and install my old unit.
buy and install a genuine bmw transmission filter, as per RRPhil claiming often times secondary brands can have the filter element sucked inside.
measure all the solenoid and pressure regulator resistances in my existing valve body for reference.

determine the canbus waveform and voltage specifications for my vehicle. start to troubleshoot the circuit and remove modules connected to the canbus until the poor signal / issue can be identified.

update the graphic in the previous post with correct pin numbers and resistances for resistance tests.

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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project.