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Update. To try to resolve the flashing p4 error, I cleaned the two electrical connectors to the transmission with electronic contact cleaner and compressed air. No change.
I noted that the flashing warning lights match the gear selector and fourth gear. So if you are in park you see p4 flashing. If you are in drive you see d4 flashing.
I let the car run for a while in drive up on the lift. No change to the flashing transmission warning lights.
Then I read the codes with torque. No stored or pending codes. I do realize torque does not read transmission codes on the boxster. Then I cleared the codes to reset the ECU and boom the flashing p4 went away.
Victory!
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