Ductwork repair service call. Excavated the area where the hardwood flooring is removed in order to expose the supply duct coming from the furnace. Replaced tee fitting with a new metal one. Installed two patches in main air duct run going to the guest bedroom. Epoxy coated areas where white dust was present. Resprayed all of the underground duct work with duct armor. Backfilled hole with 3/4” stone and concreted hole.