Cross-check Tesla gateway serials against registered systems and DOWs

Grace supplied 30 Tesla gateway serial numbers in Slack thread 1784922320.292949. Parse the pasted list; query current production records read-only to identify each serial in registered systems and DeviceOnWorkspace (DOW), including safe match/contact/site/reference details suitable for review. Deliver matched/unmatched breakdown and a review-only CSV if requested. Do NOT execute any enrollment or bulk import. Source: Slack message 1784922364.995299.