There are no known inherent faults with the mechanisms on D20 or any other "D" followed by two digit machines so I dont really know where you received this information, however the D20 "is" on the list of models that were fitted with CCD's that have the potential for developing a fault. By the way the charge you were told about is, or was, a standard handling charge for just looking at the device but not doing anything to it, although the CCD replacement may still be done on a no-cost basis.

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