Has anyone managed to repair QC 25s suffering from the manufacturing defect? I have a pair that have just failed in the classic manner, left ear noise cancellation failed, can temporarily restore function by pressing on the ear cup but with crackling noise. These are way out of warranty although they haven't been used that much. Bose will only offer me a £100 reduction on a new pair but it would still cost £209 to replace them. So I have nothing to lose by pulling them apart and attempting a fix - if such a thing is possible.