05 STS Starter Switch Replacement
 

I have a 05 STS, 35K,keyless entry vehicle. Coating is coming off starter switch. Want to replace. Dealer says out of warranty-Wants $285 to replace. Looking for info on "How to replace". How do you pull off panel underneath steering wheel? Is switch replacement a computer issue? Where can I find manuals for same? It really don't look like a big deal. Ur help greatly appreciated!!
"PEACE" Ol Guy