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Apart from the pads, since now you have good access to these parts, I would carefully inspect the variocam units for rubber debris coming from the internal O-rings. They tend to fail in cars been sitting for a long time. You can take the solenoid off, pull the small piston out and look in there with a flash light. If you end up removing the camshafts to see the lower pads you can also test the variocam by blowing air into it and see how it operates. Good luck!
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