Hatches The second most common offender is improperly installed hatches which, just like improperly installed stanchions, are extremely difficult to correct. In this case, you can remove the hatch frame, recaulk it, only to have it start leaking again. While the deck may be strong enough, the hatch opening may be improperly designed. Whatever small about of deflection there is in that deck is going to break the screws and caulking loose. Remove the frame and check if the hatch is screwed into the core.
Chances are it is, and if that's the case then it can be fixed fairly easily.
My deck was very weak, so what I did was to cut two fir frames and heavily glassed them to the underside of the deck, one forward and one immediately aft of the hatch. Since the headliner was glued to the underside, I opted to replace it with new white vinyl and contact cement. Took 3 hours with 2 people. Then I smoothed off the rough inside laminate surfaces with a sanding disc. If the deck is slightly curved, you need to shape the teak strips accordingly by planing them to the proper contour.