Tech found thermostat satisfied at 73. Tech tested all capacitors, drains and refrigerant pressures. Capacitors were good and drain pan is empty. Tech found low suction and low superheat indicating low airflow. Tech made sure coil was not blocked and filters were good. Tech found blower on the low setting and changed to high. Pressures are good now and superheat increased. 17 degree delta T. Tech found blower board and the area around has signs of corrosion. If any of that gets into the board, it can cause issues with the relay. Tech quoted blower board replacement. AHU 8. System is cooling properly at this time and has dropped from 73 to 72.