Patient transport handled by Preston EMS at TMC Heard on: Tom Bean Fire 00:15 00:00 Grayson County from Preston EMS. Transcript This transcript is auto-generated from live dispatch audio and may be incomplete or inaccurate. It is not an official report and may change. 00:00 Grayson County from Preston EMS. 00:04 Preston, go. 00:07 You show Preston EMS at TMC, Grayson , 2026-09-15 18:25 UTC Medical Emergency N Hwy 75, Denison, TX 75020 View on map