Arrived on site, customer stated ac was putting out warm air and not cooling the upstairs. Upon initial inspection, it was noticed there was rust in the emergency drain pan. Indicating that there is or was water not draining properly. It was found that the refrigerant pressures were very low. Suspected coil leak. Found leak in evaporator coil on the back side. Recommended coil replacement to restore systems cooling functionality. Customer decided to go forward with the repair. Deposit collected, will pick up coil today and schedule return date to complete repair. Est time for repair is Tuesday -Wednesday.