My valley pan gasket went south a while back as well on my 4.4i. They have to pull the head and valve covers off to change it out. Its a 2 day job. Good thing your CPO is covering it because its a $2000 job i've been told. Mine was covered by factory warranty. Good idea to replace those breather hoses while they have it all apart. Normally they are hard to get to because they are between the engine and the fire wall. They have to pull them off anyway to change the valley pan gasket. Because of the excessive heat in the breather (PVC) hose location these hoses usually are crumbling by 60k miles.Also my 4.4i was sucking down oil like a beast before this problem was fixed. It was eating a quart every 1-2k miles. I was told that there is a seal under the valve covers that goes bad on a lot of e53's. When this happens you get too much air in the intake manifold and that somehow causes the engine to eat oil. Of course when they change the valley pan they have to change this other gasket as well that solves the problem. My X has not eaten a drop of oil since the repair. I have put 15k miles on it since having this done. Thats 2 oil changes for me. And its been 8.75 quarts out......exactly what went in. No annoying engine oil low indicator anymore thank god.