Ok folks, I have been putting this off, but (according to wife and kids) I really need to get the light working again. Light worked fine from pool build completion (late 2013) until closing (mid October 2013). It hasn't worked since and trips the breaker every time you attempt to turn it on. If you put a regular breaker in (not GFCI) light works fine. Due to safety concerns, we refuse to leave the regular breaker in place. Based on troubleshooting attempts thus far, and talking to at least two electricians, we think the problem is with the wire between the light and the panel. I don't know how that could be the case, but in order to prove it one way or the other, I'm planning to pull the light and wire completely out. Problem is, when I pull the light out of the niche, in the back where the wire runs into the conduit the opening is "sealed" with something that is hard like mortar or cement. It is white in color.
1) What is this?
2) How do I get it out?
3) Will I need to replace it when I put the light back in?