Left speaker only working intermittently, crackling noise with ANC

Left speaker only working intermittently, crackling noise with ANC
Hello good repair-inclined folks,

ANSWERS:

@cistron check the wire and solder connections on the driver. Resolder if possible. Also check the wires in the barrel connector. If those are all okay you know it is the driver but it does sound more like a bad connection
Sorry to resurrect this… How did you get on?