Televised ducts under slab floor. Ducts are concrete ducts with metal fittings and connections. There is standing water in some of the runs and also the plenum. There are leaking gutters and downspouts that need to be fixed. If that does not solve the water issues then it is suggested to put in a sump pit and pump in the garage near the furnace. After water issue is resolved the ducts should be spray lined with Duct Armor duct lining material.