Looking at the 73, it would seem it works through Biddick Centre, then along the A195/Pattinson Ind Est to Waterview Park (3mins is very tight in a car, never mind a bus!), then some sort of loop from Waterview Park, via Sulgrave to Concord and back, before picking up the A1231 to Castletown....
Edit. It doesnt seem to serve Coach Road from the Galleries - just from Sunderland
RE: Go North East