The other parts don't need replaced though, they were just showing as failures because the taillights were jamming the bus. That isn't ideal, but Tony made it

The other parts don't need replaced though, they were just showing as failures because the taillights were jamming the bus. That isn't ideal, but Tony made it sound like parts had to be replaced all over, not that it was just difficult to diagnose failure in the taillights along with the taillights being ludicrously expensive.