So recently my Sennheiser HD 280s started sounding noticeably quieter in the left ear. I opened her up, and it looks like there's some wrinkles on the driver (see image). Is this the likely cause? Does anybody know how to go about popping these out? I tried blowing in them from the other side and I also tried popping it out with some duct tape- no dice either way. Thanks in advance for any thoughts!