You need to look at the seams to see if they have remained sealed. After five years, there are probably some gaps that would benefit from scraping clean and refilling with Acryl-R.
You also need to look at all of the sealing around roof penetrations. The drain stack vent caulking around my waste pipe vent had a huge gap in it and the antenna and front vent needed resealing too. Forget what sealant is used there. (Not silicone - that's bad.)
Read through some posts in this blog
, especially the ones tagged "maintenance." Bill does a great job documenting stuff, especially the care and upkeep of his Safari.