AIG20 wroteInformation from The Stagecoach North East twitter page:

#NclOps With immediate effect we have had to take the difficult decision to reroute the X63 service. Regrettably this will mean that there will be no service X63 on Kilingworth Road through South Gosfroth and BT Call Centre. Service will operate  full length of Benton Lane

Is that a reversion to the route used during the closure of the Metro bridge?  The tweet sounds a bit dramatic, though; has something specific happened?