The roof guy put more sealant in the cracks in the mortar. He thinks that the roof wasn't done correctly or consistently because the roof closer to the chimney is chipped, falling apart, and has gaps, whereas the roof further away is more smooth and doesn't have that problem. If we still have problems, he suggested rebuilding just part of the roof and then using paint to make sure the color matches the existing ceramic tiles. Anyway, he says that I should text him back after the rain comes on Sunday night with a 👍 or a 👎 about the leak.