is this it ?

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E70 Displays, Indicators and Controls
Activating Service Mode
Select main menu and press and hold the controller. Tactile feedback will then be generated.
• Turn controller 3 stops clockwise
• Turn controller 3 stops anti-clockwise
• Turn controller 1 stop clockwise
• Turn controller 1 stop anti-clockwise
• Turn controller 1 stop clockwise
• Press the controller to confirm, Service
mode will then appear in the CID.