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2013 Volkswagen CC Questions

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It's leaking above the oil pan can't really see where it's coming from.
I hear a loud whistle\chirping sound when accelerating my car. It only happens during acceleration. When the car is in park and I step on the gas, I don't hear that sound at all.

VW tech did a carbon clean on the intake manifold about 2 weeks ago. I started hearing that weird noise afterwards. Tech also replaced the diverter valve. No success. I know he removed the airbox and the air intake when he did the carbon clean. I already checked all the hoses and clamps and they look seated correctly.

No engine light, no loss of power. Engine runs smooth, except for that weird whistle noise during acceleration.
2.0 TSI engine.
Everything electrical is still operational
rear wheels may need spark plugs or struts
When I shut my trunk and turn on my alarm the tail lights will steadily flash and will not stop..and right now till I get it back to the dealer I cant close it all the way down (the trunk) that is seems to be some kind of short or malfunction in the electrical system...helpppp.
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