Televised ducts under slab floor. Ducts are PVC ducts with metal elbows. Metal elbows appear to be in good condition. They’re was slight water in the area of the sliding glass doors. Ran water in kitchen sink and laundry and did not see any change in the water in the ducts. There is a downspout outside the area where the wsliding glass doors is located that is not extended away from the house. In addition there is a burn that keeps the water from draining away. Suggest extending downspout to reduce the amount of water accumulating next to the house then spray lining ducts with Duct Armor duct lining material to encapsulate the moldy PVC ducts.