I'll warn you that I am much more conservative than probably most. I agree that the light bulbs aren't a problem but I'd think twice before I'd do a serp. belt. It's just too close a call for comfort.
But what really guides my decision isn't that I don't think I could argue with GM and win. It's why am I fighting the used vehicle department's battle? If GM calls it reconditioning and charges it back, who pays? The service department! Why am I absorbing the risk for the used vehicle department. Besides if you leave this cost out of the car, they'll probably just give it away on the deal. Sure it might not be this particular belt that is going to be questioned, but over time similar judgments can really add up. To me (and for the service department) these costs are better given to used vehicles than on my shoulders.
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** Rob, Editor WD&S **Help is only a message post away!
robc@dealersedge.com