I appear to have an issue with my VersaLink C600 printing greens & yellow. All toners are above 40% and all drums above 60%. The images below are supposed to be solid colours - yellow is 100% Yellow. Could this be a faulty Cyan toner? Although as you can see the yellow also appears to be affected. I've cleaned all durm heads and the sensors at the rear of the machine where the imagiing unit is. The machine only has less than 30k prints and is a year old.