Arrived at location and inspected 3 comp sink in kitchen. Connections to basket strainers are leaking. They would like a quote on replacing all piping. Also inspected tankless water heater for an error code exhaust blockage. The previous company did not get fresh air for these units from outside, these 5 units get fresh air from inside the laundry room. This is causing the inlet fresh air screens to get clogged with dryer lint. Removed dryer lint and reset tankless. It is working as should. Also mentioned to me one day they had no hot water on the 4th floor but the following day they had no issues.