On arrival found supply plenum saturated with water from evap pan. Bio growth preventing the air Handler from draining correctly. Cleared drain line and evap pan of growth. Installed pure x UV system to prevent bio growth from forming in the plenum and duct work. Cleaned all accessible surfaces in the air Handler of bio growth. Home owner purchased maintenance membership. System is now draining and cooling properly. Office to schedule follow up to check plenumsnhave dried and to preform 1st maintenance. Customer would like jeff (me) to follow up.