Called out today to perform a precision tune up on a 16 year old machine. Checked all electronics and motor components to ensure equipment is operating properly within manufacture specifications. Checked drier and cleared drain line. Drain pan had sitting water. There is no emergency drain line switch. The secondary pipe just has a piece of tape over the PVC. Recommended adding a float switch to prevent water damage. Measured the temperature drop across the coil. Filter was extremely dirty. Outside I removed the fan from the condenser to find the coil to be completely corroded. Checked refrigerant pressures. Noticed that the contactor is pitted at the coil and buzzing when energized. Cleaned condenser coil. Vacuumed drain line clear from outside port. Gave options for preventative repairs… made client aware that this machine is on its last leg. He is aware that this machine needs to be replaced. He would like a comfort advisor to come out tomorrow morning from 8-10 arriv