Brushed and vacuumed flue pipe and heat exchanger Replaced oil filter, nozzle, and strainer Checked all electrical connections and safeties Performed combustion and smoke tests 6.8%o2 33ppm co 0 smoke While performing the maintenance we found a hi-vent leaking on the boiler. After getting customer authorization we replaced the hi-vent. Unit is working properly. Boiler pressure when leaving was 20 psi We found the indirect water heater’s pressure relief is dripping slightly. The tank is from 2007. Took pictures to offer a replacement quote. Typically the tanks lasts 10-15 years.