I had an issue with Fader 15 sticking during calibration on one of my DM-24's. It would stick at the top of the calibration and make a buzzing noise. It would hesitate and finally finish the calibration but the Fader would not return to the previous setting and volume output was low. I thought I would need to replace the Fader and searched for a replacement Fader or PCB module with no luck. I then thought of my next (should have been the first) option, clean it. Powered off the mixer. I used a can of compressed air to clean out every Fader. I have a can of CaiLube MCL Fader Lubrication, I have had for several years, and sprayed in all Faders. NOTE: (Name change in 2006: From CaiLube MCL to DeoxIT FaderLube, part numbers remain the same) http://store.caig.com/s.nl/sc.2/category.293/.f A short blast from top of the Fader to the bottom. I made sure I had the Small red tube on the can in the slot of the Fader. You may need to use a flashlight to see down into the Fader slot. You want to make sure you are spraying in the Fader slot and not just in the opening of the mixer frame. The Fader sits sightly below that opening. I then moved each Fader many times from bottom to top of Fader range to clean and lubricate the Faders. Some of the Faders started to "stick" during that process. I kept moving the Fader until the "sticky" feeling was mitigated and moved freely. Once all Faders were cleaned and moving freely, I used the compressed air to dry out any remaining lubrication and cleaned the top of the mixer with a microfiber cloth. I powered on the mixer and "Voila", the calibration completed with no issues and the Faders are now very smooth with no volume issues. Next step is to clean all the XLR and 1/4" connections with DeoxIT D5. http://store.caig.com/s.nl/sc.2/category.188/.f Hope this helps others with DM-24 "Sticky" Faders.