I have a call into Pentair on this but I thought I'd put this out to the group to see if any of you have had this happen:
I built a hillside vanishing edge pool in Marin County, CA about a year and a half ago, 16' x 40', one side and one end VE, autocover, etc. We lit the pool from the non-VE side with (3) 250watt incandescent Pentair lights in small nitches. I just got a call that the pool lights were not working so I had them check the breaker and GFI plug in the Jandy Aqualink panel; both checked out on and normal. I went out and checked power at the J-box which has power to the light cords. I have been in this business for over 35 years and have never seen this happen. The lights are in a bench which means diving in the pool to pull them out to check the bulbs, which I have not done as yet since the pool is about 55 degrees. Lights are all installed correctly with triple grounding as required.
On the hillside about 10' below the pool the owner has a large photovoltaic solar electricity generating system which is ground mounted on a concrete pier/grade beam foundations. Not sure if this makes any difference but I did question the general contractor and solar installer about any possible problems with the solar being installed so close to the pool. I was assured that it was all done to code and there would be no problems.
Of course, on a multi-million dollar home project, the GC wants me to repair/replace the lights under warranty even though the warranty has expired. The GC does give me work from time to time so I do need to address this, but I don't want to do the repair just to have it happen again.