My E220 CDi (2013) Facelift (W212) bonnet (Hood) will not open. When pulling the red bonnet release lever beneath the parking brake release lever the bonnet should pop up allowing me to reach in and open the bonnet fully. It won’t even popup. I could take it to a Mercedes Dealer but can only imagine their high charges so that’s a last resort. I’m certain there must be an emergency release procedure. Can anyone help?