Service spanner light just came on at 129k km, but service sticker says 137k km. Why so early?

Hey everyone,

My service spanner light turned on yesterday at 129,356 km. My service sticker from the last service says the next service isn't due until Jan / 137,000 km.

The light wasn't on when I picked up the car from the mechanic, so it wasn't a case of them forgetting to reset an active warning light.

Why would the car trigger the spanner light over 7,500 km before the sticker interval?

Thanks for the help!

https://preview.redd.it/dnqp9cveb8mh1.png?width=557&format=png&auto=webp&s=efc3e6ded0aa3884690c9c2285be8a8fcc7ca79f