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The code you have supplied comes back as Shift Solenoid (Performance or Stuck).
Potentially you could be looking at the solenoid itself, wiring to the solenoid or the conrtrol module. It would need further investigation to determine which part needs replacing.
If memory serves me correctly they are inside the transmission assy. You take the sump off usually and there is a plate in the bottom that contains a number of solenoids which control the oil flow to clutches and brake bands.
I have changed these in the past however you need clean facilities to work on Auto Transmissions and hence this is usually classed as specialised work.
No problem at all.