Customer called for no air-conditioning. Upon inspection I found that the condenser was shut down due to a wet switch in the pan in the attic. Reset the switch and got the unit running. Once the unit started up it was barely cooling. Checked system pressures and they were next to empty. System is 15 years old and must have a major leak somewhere. Due to the refrigerant being R22 and 15 years old it is recommended to replace. Forwarded the job to Comfort Advisor to Quote for replacement.