What if repairs to my car are defective, but I've already settled?

In Franz v. Tribeck the Court of Appeals recently held that even if a person had settled his property damage claim from an automobile accident - and received compensation for both the repairs and diminution of value - the owner of the car could still sue the garage owner for defective repairs.  In this case, the garage owner had argued that since the owner of the car was paid for the fact that a wrecked car, even if repaired, is worth less than an unwrecked car, he could not sue the garage owner for poorly performed repairs.  The Court sounded rejected that argument.