Sunderland Depot are operating South Shields routes according to Bus Times:
Vehicles on the 3/4:
36976
36974
36964
Vehicles on the 10/11:
27732
28016
27740
28034
Also in Sunderland 19641-3 are on the 3, 19644 is on the 20 and 28002/22 are on the 23.
RE: Stagecoach North East: Rare & Odd Workings - December 2019