these cars have issues with the dsg mechatronic as a norm.
i have changed mine out before and it fixed the issues i had.
it was a different code so for yours i would start with the fluids. replace the fluids and filter and top them off properly first since your down there.
when i changed out the mech unit i didn't bother with just checking which solenoid was bad. i just changed out the whole unit for a brand new one. way easier and peace of mind knowing that the entire unit is new. different codes tho, so i wouldn't really go that route for you yet.