MTI.....thanks for the link to the VDO CC info

Quote: 'All of the 10-pin amplifiers store the "set speed" as an analog voltage at the junction of a capacitor and the gate of a dual-gate field effect transistor (FET)'

Seems a leaky capacitor at that gate would be the likely suspect........probably an easy fix to try if I could identify the FET & capacitor.........replacing all the capacitors could be an option........may consider it if my cruising speed drop rate increases

Anyone have info on the board layout or circuit diagram?