It's an inspection at either 25,000 miles or 50,000 miles. Off hand I can't remember exactly for that year as it's not something that ever causes much trouble. I'll go out to the garage tomorrow and check the manual and let you know.
I checked every TC manual I had and none of them list the miles to check the tensioner shoes at, but I KNOW I read it somewhere, so perhaps it was a service bulletin. (I no longer have access to those.)
At any rate, your 2007 wasn't one of the years that had the chain problems. If you're a worrier you can check them at around between 25,000 to 35,000 miles, just to get a baseline on how they are wearing. After that plan on checking them in another 50,000 miles or so, or in other words around 75,000 - 85,000 miles.