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I got the o-rings for the activation piston from the (expensive) dealer ship - the o-rings I replaced were actually two per piston - a small o-ring inside and a blue (I guess) Teflon cover. From the dealer I got only one bigger o-ring.
The OD was already slipping before I changed the o-rings - the change didn't change anything - the OD starts slipping after I drive for a while (esp. when decelerating). I’m slowly running out of ideas, what could be the reason.
How do I notice a bad solenoid? Since as you said it’s probably not the pump, the only left over is the solenoid – but if it is bad, why does it work in cold conditions??
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