A weekly check of a few things can help you avoid problems down the road. Catching problems as soon as they start can make treatment much easier, and give your vet a chance to get on top of the situation before any larger problems occur.
All of the things below are easy to check, and many of them can just be noticed as you interact with your rabbit - your bun won't even know you are doing a health check!
If you see any issues at all, of course get an appointment with your exotic vet as soon as possible. Need help finding a vet? Or dealing with the vet trip? Here's some help.