Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hi, I am Mike, welcome. I'm reviewing your question.
What plugs are you referring to? I wasn't aware that there were plugs on a rack and pinion gear housing.
And no the leak is probably not going to be covered under warranty. Buick does have a good warranty but I believe it's only for 3 years and expired 10/3/2012.
If it's a fitting leaking, try tightening it up with a flare nut wrench.