Cannot open rear liftgate on 2008 cayenne. Motor sound when button is presses, lift gate becomes temporarily ajar. opens about 1/4 inch on left side, right side seems stuck. Changed fuses #30 & #31, opened square plastic cover on inside of lift gate, moved the level, still wont open. When I press the open button, I can fell the lever moving inside the lift gate. Seem like the right side of the lift gate is LOCKED. Are there lock pins on both side of the gate that need to be released before the gate can open? If so, how do I access them??? Also, I get the warning display on dash that the rear gate is opened, seems like it wont fully close either.