I had them come out to do maintenance on my furnace and check on a leak near the water heater. He serviced the furnace and then checked all my sinks and toilets for possible problems. We then turned on the faucets in each room to see if any water would leak and when it didn't, he suggested that rather than cutting into my wall, we wait to see if leak recurs and if so to call. I found him honest and agreed that it could have been rain or some other leak. I highly recommend them.
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