Sorry, don't have any suggestions for you.

I'm willing to lend you the actuator I took out of my 2001 that was getting long in the tooth (but still talking to the car) if you want to test swapping out the actuators. I didn't see what year your vehicle is, so don't know if mine will fit.

PM me if you want it - I just ask that you return it when you are done.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles