Complete member tune up. Change customer supplied filter. Inspect electrical components. Test amps and volts. Ensure system is running properly in all modes. Clear out condensate drain and pump. Delta t measures at 23 degrees. A picture of the evaporator coil will be uploaded to ST. There is no biological growth inside of air handler cabinet. At condenser checked pressures, temps, amps and volts. The contactor was pitted and burnt. I replaced the contactor. System is in good operational condition.