I clocked 331009 (14/04) at Dinting on the Man Picc-Glossop.
From the video still, you can see white marks on the soleplate where various structure is attached. Is this an indicator that examination has been carried out?
I think that may be part of inspections they do - I have a photo from Feb 2020 and similar parts of the train have been cleaned to show numbers or whatever it is they display. I mean it does show that they are checking certain areas for sure though but I don't think it's unique to this specific problem.