A processor may receive a request including a vehicle identifier, a first symptom identifier, and a second symptom identifier. In response to receiving the request, the processor may determine a circuit element identifier to include in a reply to the request. To do so, the processor may make a determination that the received vehicle identifier matches or is mapped to a stored vehicle identifier, that the received first symptom identifier matches or is mapped to a stored first symptom identifier, and that the received second symptom identifier matches or is mapped to a stored second symptom identifier. In response to making the determination, the processor may determine that a particular circuit element identifier is the circuit element identifier to include based on the particular circuit element identifier being mapped to these stored identifiers. Then, the processor may generate and subsequently output the reply including the determined circuit element identifier.