Nexus timetable has shown Peter Hogg are withdrawn service 131 and replaced it with a new X74 service. From what I can gather it's

Peter Hogg Of Jedburgh are withdrawn service 131 and replacement will be new X74 service running Monday to Saturday with 3 journeys each way. 3 from Newcastle to Jedburgh and 3 from Jedburgh to Newcastle. Service will depart Newcastle Eldon Square