I have a client that we now take care off. 4 columes with caps which have 6 inch LED lights under each wall. Each colume has what I would call a sitting wall between the two of them so 4 total with firepit in middle. Well they called today and they have one light working which is closest to the transformer and outlet. I did take the caps off which were heavy and see the wires that go down and look to go under either the paver patio or the outside uder the sod. So question how do I check it things work? I see no traces of little critters, no pets, they say its been three years now and until the other night they lost 3 of the 4 lights??