Check engine light on ,obd2 says shift timing soleniod malfunction, 3-2 shift selenoid circuit electrical( po#785).how do 1 identify which sensor in the tranny to replace?

check engine light on ,obd2 says shift timing soleniod malfunction, 3-2 shift selenoid circuit electrical( po#785).how do 1 identify which sensor in the tranny to replace?
You should confirm that the solenoid is actually at fault.
You can identify the solenoid by it's wiring here:

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