29. A computing system comprising: one or more processors; and a non-transitory computer-readable medium storing instructions, that when executed by the one or more processors, cause the computing system to perform functions comprising: receiving, from an additional computing system, a message identifying a symptom of a first vehicle; and sending a repair tip to the second computing system, wherein the repair tip comprises: a first phrase describing a first procedure performed on a second vehicle that exhibited the symptom, wherein the first procedure performed on the second vehicle yielded a result insufficient to determine that a component of the second vehicle associated with the symptom is defective; and a second phrase describing a second procedure performed on a given vehicle, wherein the given vehicle is either (i) the second vehicle or (ii) a third vehicle that also exhibited the symptom, wherein the second procedure performed on the given vehicle yielded a result sufficient to determine that a component of the given vehicle associated with the symptom is defective, and wherein the component of the given vehicle is equivalent to the component of the second vehicle.
29. A computing system comprising: one or more processors; and a non-transitory computer-readable medium storing instructions, that when executed by the one or more processors, cause the computing system to perform functions comprising: receiving, from an additional computing system, a message identifying a symptom of a first vehicle; and sending a repair tip to the second computing system, wherein the repair tip comprises: a first phrase describing a first procedure performed on a second vehicle that exhibited the symptom, wherein the first procedure performed on the second vehicle yielded a result insufficient to determine that a component of the second vehicle associated with the symptom is defective; and a second phrase describing a second procedure performed on a given vehicle, wherein the given vehicle is either (i) the second vehicle or (ii) a third vehicle that also exhibited the symptom, wherein the second procedure performed on the given vehicle yielded a result sufficient to determine that a component of the given vehicle associated with the symptom is defective, and wherein the component of the given vehicle is equivalent to the component of the second vehicle. 30. The computing system of claim 29 , the functions further comprising: generating the repair tip by generating (i) the first phrase and (ii) the second phrase, wherein sending the repair tip to the second computing system comprises sending the generated first phrase and the generated second phrase to the second computing system.