headphones - need repair (Jericho OX1)

3 pairs of wired, on-ear / over-ear headphones.
White pioneer ones are at least 35yrs old.
The grey ones are/were noise-cancelling.

Not working - not sure if it's a lose wire?

Collect Walton Street, OX1 2HQ. Weekday daytimes only.
If you're interested please suggest a couple of times when you could collect, thanks