I am in the process of filling my pool back up and decided to take the pool light out of the niche to see why it is tripping the GFCI breaker. It was very obvious why it was tripping once I pulled the can out of the wall. It was half full of water. I took it all apart and plan to replace the bulb and gasket. Do I need to look at replacing anything else? Everything seems to look almost new. It is made by American Products / Model No. R-500 BC. I am having a hard time knowing for sure what gasket to purchase. The bulb is a 500w Helco but have seen some specify R40, not sure what that means. I put the lens back on and held it under water for several minutes and never seen any bubbles come out but I figure since I have it apart I should go ahead and replace the gasket.