I'm looking for the music cue that plays towards the end of the mansion chapter. It plays when you first see the Wretch, outside of the guest bedroom. Also, if I remember correctly, it plays at some other point in the game. I checked the music files and couldn't find it anywhere under the mansion folder.
Could it be in "...\sounds\events\mansion\pig\" ?
The sound when the camera zooms in on the blood? redist\sounds\music\mansion\Freak_room_110.ogg
Sorry, away from the computer now, can't personally check the files myself to see if they're the ones.
The scene is right after you activate the valve behind the faux bathroom. You come out of it, and all the electrical lights are flickering as you hear and see the Wretch for the first time. It's the first scene shown in Pewdiepie's montage.
Edit: Found it, after tons of searching. It was located in sounds/events/spooky/afx_spooky_bowed_01.ogg. Feel free to lock.