Dear all, I've noticed some jerks or hold backs into my transmission since done the service on it but as a precaution measure I've decided to do the gearbox service once again. After 2k miles, the oil is kind of brown/yellowish instead of blue but looks clear. When the last service has been done, genuine Mercedes oil went in, which was blue and now looks like it turned yellowish/brown colour. I suspect the jerks could be from one of the solenoids in the valve body but I'm more concerned about the colour of the oil. Does the transmission colour change even after 2k miles or I should be checking anything else? Any input would be highly appreciate it as I really need help.