After much back and forth, I was able to determine that the problem was not in the chimney, but in the roof. Christian Bros did not install the flashing around the chimney very well. Indeed, the first time the chimney company came out they pointed it out but Joel dismissed it as a possible issue. I gave up asking Christian Brothers for help. Joel argued with anything I said about the quality of the roofing job. He then proceeded to tell me to write him a 5 star review after saying he found the problem and the chimney people could fix it. I wrote that review before I realized that I had been gaslit by Joel. He also tried to get me to let him list his house under his new real estate company. So I spend roughly $10k trying to fix and find the leak. Christian Bros offered me back my $500 that they charged me to come out even though this was under warranty. Horrible experience. Their warranty is a figment of imagination.