Looks like a j-345. You can pull the back and side panel off and look to see if the paper that contains the foam is wet anywhere, also you can fill the tub back up and heat water, then when searching for leak you feel for warm water. with a leak that is not obvious like in the equipment, or wet paper the water that has pooled in the pan can be deceivng as to where it came from if you feel warm water then you know you are on the right track. unfortunately if you pull the panels off and don't see any wet paper it could be one of the foot well jets. start with that. i would go panel by panel. that water in the right corner could have come from the other side of the spa. you will have to remove some insulation more than likely to find and fix problem, but the dealer will should be able to sell you a foam kit to replace it.
