The seat belt issue is common. My understanding is that everything before '02 or '03 is lifetime (after is ten years), so the dealer should cover it. Here's the TSB for what they try before replacing the whole belt assembly. Mine ran a little faster after I cleaned out the gunk. An earlier version of the TSB has you slide gauze or cheesecloth in between the belt and the ring and polish the gunk off that way, worth a try if you don't have the right size of wire handy.