If it didnt leak until you filled it over the top jets, then one or more of those is lenkaig.Usually, these have a small gasket, on the backside of the shell, between the fitting and the shell. Most of these simply screw in from the front, so I would suggest trying to tighten them first. If there is still a leak, then you'll need to replace the gasket. Any spa dealership should be able to get the correct gasket for you ..worst case scenario, you could make one, or apply some silicone to the backside.Most spas have removable panels, making it easier to get to hard to reach areas. You may be able to remove the panel, and see just which coupler is lenkaig.Good Luck