You have a 4-stringer Moesly hull, and I've never heard of a stringer problem in any Moesly boat. The stringers were installed about half way through the layup, as described in great detail in
this article. The inner liner was then bonded to the top of the stringers, creating a relatively light but very stiff I-beam. Unless you have a large crack in the hull, I wouldn't even consider removing the deck just to inspect the stringers! You are much more likely to have a problem with a soft deck or transom than you are with the stringers!