Hi Folks

Bought a house 6 months ago, has a Marquis sport 700 spa. It has developed a leak, about 2-3 in a week. Its dry in the access doeer, and I pulled the other 3 panels off, and it looks dry, but I didn't tear any foam out. I have a sneaky feel its one of the bottom suction fittings, and I took the screens off to clean them, and they was a few pieces of silicone floating around. So what do you do, dig foam out of the sides first to make sure its up higher? What do you replace the foam with? And if not what then, drain and flip it up? I've never seen the bottom of one of these, does it unscrew? Help