Most leaks are around the sealing gasket. Most likely the leak is from a bad gasket and you need to replace the sealing gasket carefully so it seals properly. If water has gotten in, you probably need to replace the bulb as well. It is possible for water to get in somewhere else, but gasket problems are the most common cause.
We actually did change the gasket and the bulb and it was working perfectly. Then within a few months we had water again in the light and it went out once again.
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