10/16/25 cleaned all underground ductwork and applied trenchless spincast mortar to all connections and elbows. Repaired and rebuilt furnace supply box and all register vents with hydraulic cement. 10/17/25 Applied first application of RS-100 to all underground ductwork and furnace supply box. 10/24/25 Applied second application of RS-100 to all underground ductwork and furnace supply box.