1/27/25 Cleaned all underground ductwork. Applied trenchless spincast mortar to all underground connections and elbows. Rebuilt furnace box and all register vents with trenchless spincast mortar. 1/28/25 Applied first application of duct armor to all underground ductwork and furnace box. Applied duct armor to each register vent. 2/5/25 Applied second application of duct armor to all underground ductwork and furnace box.