First, I checked the number of actuations.
2nd, I did a AFMA on all my lenses, the results were similar to my 5D MK II
3rd, I put the lens cap on and took exposures of varying times, and then looked at the dark frame for excessive hot pixels or noise.
4. Took photos with my lenses with varying settings looking for over or under exposure.
5. On the 2nd Day, I started taking photos.