Service diagnostic found that the primary drain line was clogged and water had backed into the closet in the garage. I also found the indoor 1998 furnace system is in really rough shape. The supply plenum is not sealed. The blower wheel and furnace system are dirty. There is also no water safety switch on the system. I went over my findings and presented repair options to the homeowner. She chose to have the drain line serviced at this time. I cleaned, flushed and treated the drain line and secured the furnace light switch. I then function tested the system. The system is operational at completion of service.