At 107k mi I just had to replace the "cam cover plugs" on drivers side head which had a moderate leak.While cleaning up I noticed the power steering pump was wet on the top and a little oil had dripped onto the crossmember under the engine. Upon removal of the pwr st res from the pump it was evident that the gasket/o-ring was installed incorrectly at the stealer while it was in for cam position sensor replacement(warranty) on drivers side head. Its easy to roll the o-ring when installing. A new one put in/on with the flat side being the internal sealing surface(on pump suction) and the angled side towards the res. Just wanted to pass the info. Total cost was $15.46 for o-ring and a qt fluid + 1hr of my time(repair and cleanup). MB wanted 2.5hrs at $120hr plus parts.
Rear air bags/bladders are next on the list