Full Servo Skull Guide: https://standardof.net/games/space-marine-guide/servo-skulls/chapter-12-dying-of-the-light/

This video walkthrough shows where to find both servo skull audio logs in chapter 12 of Warhammer 40K - Space Marine "House of Secrets" for players looking to attain the Lexicanum and Librarian of Macragge achievements.

Timestamps:
Skull #8 Personal Message: Worker Nathaniel [4/5] - 0:00
Skull #4 Journal: Inquisitor Drogan [3/10] - 0:56
Skull #1 Battlefield Audio Log: 2nd Lt Mira [4/5] - 1:58
Skull #6 Journal: Guardsman Alexander [4/5] - 2:51
Skull #5 Journal: Inquisitor Drogan [4/10] - 3:34
Skull #3 Duty Log: Transmechanic Petronius - 4:17
Skull #7 Journal: Guardsman Alexander [5/5] - 5:05
Skull #2 Battlefield Audio Log: 2nd Lt Mira [5/5] - 5:52