Hi, I've had my DM24 for 10 years. It's been retired from daily service and replaced by a DM3200 but I occasionally use it for live mixing. When I turn it on some of the faders are a little laggy in the power up self-test routine. Could they need to be cleaned? They feel a little sticky in their movements in the areas where they drag on the self test. Also a couple faders will jump up to max output while moving them through their ranges. Also, the 2nd Function button is pretty much non-operative. Is there a way to fix that? In fact a few of the buttons are sticky or difficult to get working sometimes. My screen is holding up with only a few lines starting to go dark. I replaced my power supply in 2010 and stopped using the board regularly in 2012.