We just had two leaks fixed n our Sealand toilet in the Mh.
One was the pedal that fills and flushes. There was small piece inside the valve, but the o-ring was leaking due to slop in the valve. The toilet had to be taken up and the valve bout the size of your palm replaced. The second leak was the water supply. We had the small hose replaced in 14 in south Carolina when it flooded the place. The nylon fitting broke on the too small hoes in a tight bend. Then it was replaced with solid nylon or other plumbing fittings. It was leaking at the joint. Replaced it with proper hose this time. Our RV's flex and move a lot.
We had water in the floor too. Wife was blaming me for poor aim at first.
She's gonna pay. :)
Looking at the parts and that you think it is an Aqua... in follow on post your mileage may vary.