Differences between PCM 2.1 model numbers 7l5.035.192 a, b, and c
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I have searched and searched and cannot determine the differences between a PCM 2.1 with model numbers 7l5.035.192 with either an a, b or c as its last digit. Is it simply the year produced? If so, is it correct to assume I can upgrade by software so that an a is functionally equivalent to c. Many thanks -
Jeremy
Jeremy