Old Dog, New Tricks

Old Dog, New Tricks is a companion quest in Project Peru.

Detailed Walkthrough
Talk to K-9 in Vault 17 after being granted entry to the Vault. Ask him to travel with you and he will tell you that his motivation chip is damaged. He will then ask you to find the chip. If you ask him where the chip is, he will tell you some likely places to find it: The chip will be found in both Lost Hills and Mariposa Military Base
 * Lost Hills
 * West-Tek Research Facility
 * Mariposa Military Base
 * Boneyard University
 * Vault 18
 * To get the first chip, travel to Lost Hills and either hack the terminal or use the code to open the door. You will then be greeted by Nelson, who will ask you how you got into the bunker. If you have previously encountered the Brotherhood before, they will let you through, and if not, they will put a bomb collar on your neck and begin the Still in the Dark quest.