ok one more question; if it is truly the valley pan:
they have fixed all hoses incl. the ones behind the engine. for this they had to remove parts of the engine cover to do so, and in the process could they have fixed the valley pan at little additional work?
I just want to make sure they dont charge me the labour twice if they should have found the leak on the original checkup/inspection for leaks.

also, would this leak not show up under pressure testing?