I am afraid I am to lazy to go outside and look at the book of words. Have you got the black plastic wallet with your hand book in? In the wallet should be the service book, in the service book are all the requirements. I think from memory you are alright for a few years yet.
Yesterday, in heavy traffic box changed down to first. CLUNK.
Personally, if it's only when the box goes from 2nd into 1st at more than stop, I would try and ignore it.
If you are concerned, either contact Honda and ask them or go back to the dealer you bought it from and give em hell, even if it's all OK. Doesn't hurt to let them know that customer is king!!!!!!!!!!!!