I've been experiencing a slight rocking in the drivers seat and I brought in my car for the 60 K service today and they said that they would need to replace the seat adjustor assembly and rails. Part 88500 2D 151OH at a cost of $836 not including labour. Worst of all it is NOT covered under warranty.
I'm going to put a call to the Hyundai Canada and find out what's up with that. I may not get anywhere but at least I can complain.