Complete 1 system a/c repair and preventative maintenance check. Discovered system with organic growth inside indoor unit which circulates air inside the home. Systems gravity drain line has spots where it runs uphill and the outdoor secondary controller is weak. Need to replace outdoor controller, at a minimum add drain line water safety to the system to shut the system down if the unit stops draining which would help prevent flooding in the attic, and install an antimicrobial ultraviolet system to combat organic growth. Could not gain access to inside to turn the system on to check pressures.