Upon my arrival I performed a biannual cooling evaluation. Made sure system was operating up to manufacturers specifications. Flushed out water removal system. Sprayed antibacterial pan treatment on coil pan. Made sure outdoor system was operating to manufacturer specifications and washed out the condenser coil with water. Did notice some bacterial growth in the air handler cabinet around blower fan wire into harness and top of A coil. Let customer know about the issue and read pricing options to her husband about installing a UV light. Customer is going to review estimates and pictures and get back to us.