Hi there! I' ve had exactly the same problem with my MPC but I managed to fix it yesterday and it wasn' t even difficult at all. All you need to do is get some 100% pure alcohol for cleaning purposes and then open up the casing of the MPC as described in many Youtube vids in which people explain how to change the pads from grey to another colour. This is really no big deal, I was kind of worried about it but when you' re careful with the screws and all that, you will be able to make it. You just need to open the casing, remove the pads and right below the pads you can see the sensors. Take a couple of Q-Tips and soak them in alcohol and start cleaning the sensors. Then also clean the pads from top to bottom and put them back on, screw everything together again and you' re done. This may sound like a stupid commercial but I was really surprised how easy it was. I am really not an expert in fixing things but everything worked out right away with the MPC and it only took me about 30 mins. Definitely worth trying before you decide to send it away. Hope I could help and good luck!
