I got my car back last night after four days. The ticking noise sound from the engine bay seem to be vanished . I started the enginine it let it running for abt. 5 minutes and could not here anything. As the matter of fact, I noticed that the engine sound seem to be very very quite when I was standing a few feet away.

Here is what they have done:

Customer states there is a ticking noise in engine area mostly at cold start.

Cause: Hydraulic valve adjusters noisey.

Performed: as per SIB 11 09 07, replaced exhaust camshaft hydraulic valve lifter (HVA), adjusted camshaft, vanos timing, and performed bleeding procedure when finished.

Part replaced"
12 11 33 7 605 330, hydraulic valve pushrod: 113065
1 11 12 7 582 245, profile gasket: 118522
1 11 36 7 524 954, collar screw: 113095
1 11 31 7 534 251, gasket ring: 118523

I hope this information helps!!!