I have a five years old Pioneer VSX-808RDS receiver. The volume control on the receiver is not working anymore. If I turn the knob to lower the volume, the volume increases. The overall response to the knob turning is erratic. A friend told me the pulse gauge/detector (whatever the name is in English) for the volume knob had malfunctioned and that it is pretty common. I'm wondering if someone here has had the same problem and if it is possible to buy a new pulse gauge to replace the broken one.