I have my '08 going in for the brake recall this week and have also asked them to replace the TPMS on both wheels due to low battery display in cooler weather. The dealer has indicated that below 50 degrees it may take up to 5 minutes for them to get up to temp and in northern, colder climes it may take as long as 30. A low battery display in those time frames is not indicative of a problem. He says Kaw will charge back the parts to them if they receive them and they do not test bad within their parameters. Obviously, the bike did not have any low battery condition under any temperatures for the first two years. I've been holding off on replacement as long as I can so that I would have the newest TPMS going forward after the warranty expires.
In what I've read over the years, I don't remember many, maybe ANY, that were ever denied under warranty. Please chime in here and let's see what the statistics are so that I'll have some data to present to the dealer if it becomes an issue.
Thanks!