Ever have an engine break down and disagree with the diagnosis? One trucking company had its warranty claim denied by Cummins twice and decided to take the engine manufacturer to court. Engines can break down for a variety of reasons, which is why many vehicle owners opt for the extended warranty. Grand Rapids, Mich.-based SBS Transport did just that. However, that warranty did not hold up for two Cummins X15 engines. In 2018, SBS Transport boug…