2006 Sonata Key Maintenance Items?
 

I have the 4cyl GLS. Seemed to remember the dealer telling me that in
addition to the scheduled oil changes (he said 3500 miles, but I see
7500 in the manual), something had to be done at 30k. I thought it was
the auto transmission fluid or a belt, but do not see anything that is
required in the manual. I do not want to void the warranty on the
other hand. Any ideas would be helpful. Thanks