I have a Jacuzzi Magnum Force pump that appears to be leaking where the pump and motor meet. There is a collar connection there and the collar has a yellow tab that can be removed-I do not know what that is for. Is there an o-ring in that collar that perhaps needs replacing? I don't want to play around with it totally unaware of how it works. It loses prime when it is off but is self priming and that works but I don't trust that and don't want my motor burning out. Any advice welcome!