I repaired this with a new ribbon cable $40 and Bock 3D printed yaw arm ($75). I decided to upgrade to the P3P camera so I have this spare. It has a few nicks and scratches, but the lens is in good shape and everything works. The gimbal is a tad noisy (I suspect the ribbon cable needs to loosen up a bit to provide less resistance) but works perfectly and there's no mic, so you can't hear anything on camera. Verified on a P3 body with a test flight. All functions are fine. Includes unused roll arm in case you manage to damage it. Pictures here:
P3A Camera For Sale
P3A Camera For Sale