Audi Concert and Chorus volume problems.

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These units suffer with a common problem of uncontrolable volume.  You sometimes turn the volume down and it goes up full, sometimes it goes down full, other times it does just exactly what it wants to do!

REPAIR:

Replace Motorolla 68hc705b16 with 68hc705b32 with modified dump (for permenant repair)

Part available from http://www.sapsuk.com