Exports passthrough tunnel topology information for specified appliance nePks as a downloadable CSV file. Passthrough tunnels route traffic through third-party endpoints or services. Two subtypes exist: 'genericPT' for generic passthrough tunnels and 'serviceTunnel' for third-party service tunnels (identified by 'ThirdParty_' prefix in alias). The CSV includes source appliance details, WAN interface information (name, label, IP, HA status), tunnel identifiers, tunnel mode, administrative state, and the WAN next hop IP as tunnelSubTypeId. Destination appliance fields (tunnelId-Z, tunnelName-Z, intfcIP-Z, intfcLabel-Z, Intfc-Z, edgeHAInterface-Z) are not populated for passthrough tunnels as they terminate at external endpoints.