This is such good news I celebrated with an extra cup of coffee. There are at least four sources of H2O above me - bathrooms, rain gutters, air ducts and HVAC pipes - and all four have dripped, dribbled or poured down water in the past three years.
Meanwhile, there are a couple dozen newly rebound or repaired books ready for reshelving. Having spent thousands of dollars on them, I've hesitated to put them back. Gregorio tells me I don't have to worry. Well, let's say I don't have to worry as much. This is still the low point of a four-story building!