Right hand speaker no sound

So I bought a set of know faulty QC35 for the purpose of harvesting them for parts. But I thought I would try and fix them first.

Did a search and found some other question thread, but it didn’t help unfortunately -
- QC 35ii right side speaker not wrking.

So when I turn them on I am only hearing sound from the left speaker. Ive popped the r/h pod cover off, unplugged and re-seated the ribbon cable, no change. The cable from the speaker/s to the main pcb on that side appears to be physically fine.

So before I start further disassembly, can I ask if anyone else has had the same no-sound issue from the r/h pod and if so what was the fault and the fix..?

thanks.