I arrived on site to preform a one system tuneup. Indoor; changed filter (clogged) and cleared drain line. Checked electrical connections, amp draw and capacitance. Found a concerning amount of mold in the system, evaporator coil is dirty and unit has a clogged blower wheal and blower capacitor is reading low. Outside; checked refrigerant pressures, electrical connections, amp draw and capacitance. System is quite low on refrigerant and the contactor is burnt and pitted. System is running, but not properly cooling.