I literally just grabbed them from this link:
Download Gears of War 3 Pep Files at 4shared free online storage service
www.4shared.com
You do have to have an account to get them, and I haven't inspected the files yet, personally, but they are indeed there (gears 1 & 2 are under the Marcus folder).
If you don't want to create an account let me know and I'll put them up on my dropbox or google drive.