The issue is to remove the valve cover, you'll have to remove a few star screws that serve 2 purposes - 1) secure the breather cover to the valve cover; 2) secure the valve cover to the engine. So when these specific star screws are removed, some of the holding force between the crankcase breather cover & the valve cover will be removed. This sealed joint is only an RTV gasket, and could result in a leak later after you replace the valve cover gasket. I don't have any 1st hand experience on this, so others can better provide guidance.

For me, before I started the cranckcase breather cover repair, I went around the valve covers on both sides & re-torqued the star screws (to the proper value of 10 N-m) that only hold the valve covers on the head. And I found nearly all of them "loose" in that they all turned a little to reach the correct torque spec. And I personally think this is a factor why the valve covers on my 2007 Coupe haven't leaked at this point.

You may want to see if re-torqueing the star screws will stop your leak. I'll bet the screws are no longer tensioned to the proper pre-load of 10 N-m (approx. 7.5 Ft-lb).

Note: In pizzaguy's post above, I disagree with the torque values he stated. My investigation earlier found that the values were 5-6 N-m (4 Ft-lb) on the small aluminum screws and 10 N-m (7.4 Ft-lb) on the larger star screws. Applying 7 Ft-lbs (9.5 N-m) to the small aluminum bolts might result in shearing the head off. These small screws only need to be slightly tighter then finger-tight. pizzaguy says it worked, and his advice is typically "rock solid". But I wouldn't do it on the small aluminum screws.

Good luck with your repair. Later,