I brought up the Service Mode by pushing the radio and menu buttons at the same time. Which brought up the following sub menu. 1 software update 2 HMI Version 3 Function Enabling Codes 4 ITR Tell I didn't open any of these windows not knowing what might happen . What are they for and are they any use to me or best left alone? Also, on the upper brake light there is a red pimple sticking out of the lense I am unable to find out it's purpose if any? Thanking you in anticipation.