7516's left (right if you were on the bus) tree bar looks like it's been damaged, and is being held together by what looks like a handrail clamp rather than what is usually used:
https://www.flickr.com/photos/nebp2/16803463387/
7514's as a comparison:
Arriva North East: 7514 / NK09FMZ by danielgrahamm, on Flickr
RE: Arriva North East: Latest News & Discussion - April 2015