pretty sure the 600 service is not require by warranty. after i bought my 2012 i was hanging at the dealer and and brought up the 600 service i had to get soon. the sales guy said thats a total waste of money having the dealer do the work. he basically said change the oil and check all basic parts, check air filter, cables tensions and everything. check bolts to the clip ons and on the lower part of the forks.
but the sales man is obviously not a Yamaha warranty specialist so it is possible i voided the warranty doing the work myself.
also what s3aturnr said about the filter being tight. also the drain plug. mostly everything on the bike is really f-ing tight from the factory.