We have been servicing the Coles 4038 microphone for some years, using original ribbons from the manufacturer. Turnaround time is normally 2-3 days.
A damaged ribbon can result in the microphone losing output level, losing low frequency response, or excessive distortion(sometimes frequency dependent). Replacement of the ribbon will rectify these problems. We can also fix mechanical problems related to the microphones being dropped or damaged, including replacing any damaged parts, and are happy to quote repair cost in these cases.
Please see the 4038 Gallery Page for detailed repair pictures