Came out for a no cool Ran diagnostic on upstairs system and found system to be very low on refrigerant. Clear drain line. Customer informed me that his filter was changed yesterday. System currently does not have flood protection. Recommend installing flood protection switches. No other work was completed here customer elected to go ahead and join up on the maintenance plan. Also elected to have installed supervisor come out to give estimates for replacement of the upstairs system. They are scheduled for tomorrow 8 to 10 AM. Based on our findings today, it might be time to think about getting a brand new system.