Shift solenoid 1 (N88 ) is the bottom centre solenoid when looking at the mechatronics with the connector at the top.
As it's logged a fault it's a pretty safe bet that it is faulty/failed.
You can't test it beyond that without removing the mechatronics.
You can replace the individual solenoids, a transmission specialist can do this. But it might be better to get a newer mechatronics from MY10 onwards as they are a newer microprocessor design and less prone to failure.
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