Leak in Overflow

I have determined I have a leak in my Galbocca (do they still make those) whirlpool tub. I have tried a # of things and it is either a fault/crack/cancer in the tub or the overflow. When the water gets up to that point it starts to leak. Is it possible to replace the overflow valve/system? Not sure what the overflow is made up of - could I mend with a flexible adhesive or sealer.

You may just need a new gasket, or tightening the screws might work. The gasket sometimes ends up getting hard or cracking when it gets old.