Volume buttons not working after battery replacement, but mute does

Hello,

I just followed the instructions here to replace the battery in my iPhone 5. I had some trouble getting the battery out, but everything after that seemed to work fine. After re-assembly, the first thing I noticed is the the vibration is really strong when ringing and there was a bit of a rattle. I opened it back up and realized that I hadn't secured the plate over the screen and data cables correctly. I fixed that and closed it back up. Still really strong vibration, but now the volume + and - buttons don't work. I read another thread suggesting that the ribbon cable may have been damaged, but the mute switch still works and I believe it gets the power the same way.

Would new volume switches likely fix this issue, or is it likely that I damaged the cable? I'm not sure I'd be comfortable doing the ribbon replacement since it requires taking the logic board out.

Many thanks

Rich