I'm not the final word on this by any means, but did you notice some are 10KB and some are 10KA? Guessing here, but the A and B might refer to different tapers(so maybe see if ALPS has a site and support area). It might also be worth a phone call to an Avid-approved service center. Allproelectronics (allproelectronics.com) in Nashville, TN is a shop I have used in the past.