Completed one system maintenance verified and changed filters. Cleared drain line with 2 gallons of drain cleaning. While maintaining system tech spoke with customer about concerns that was noticed no safety on drain lines no wet switch in drain no DAT sensor in supply plenum no bypass. Condenser dirty capacitor failing and low on Freon. Spoke with customer about repairs that needed to be done customer went with option 3C. Tested all repairs that were made at this time system is operating.