Came out to my home to look at my older model Sub-Zero Fridge that had stopped working. After 15 min they stated "unit low on charge.$2500 quote for rebuild". I said that was too much for an old unit and paid the $95 trip charge and they left. I then called another service company they diagnosed the problem as a thermostat or cold controller that had been damaged by an electical surge in a recent storm. After replacing the part for $200 including labor, the unit works great. Bottom line: Don't use Tri-City for older appliances.