were opening our pool. Our light hasn't worked in over a year so I got a new bulb and replaced it  Worked but now we are losing about 1" of water over night. I don't know for sure where the leak is. Also there may not be a light leak but it started after replacing the bulb. It's very hard to see and impossible to view inside the light casing built in the side of pool 

Does anyone have any advice. The pool is very cold so I'm very reluctant to get in to see inside the light recess casing.