took my 2010 Chev. Impala in to CarMax for routine oil change and they found... on 2010 Chevrolet Impala

1) rack/pinion on left side of car leak; they repaired complete steering gear-to include manual and power rack & pinion, worm ball.
2)Fluid build-up near headgasket on driveside of engine; Possible headgasket leak?? oil build-up near rear mail seal. They have advised me to take this car to Chev. dealership-since it is still under 100,000 mi. warranty. I phoned dealership and was told they would have to do a 'pressure check'. It only has 60,733 on it.

Asked by for the 2010 Chevrolet Impala