Cashing in Old Favors

Chapter 13 - Fallen Soldiers Determined to locate Sarif's scientists, Jensen tracked down Isaias Sandoval, personal assistant to America's most outspoken augmentation opponent. Sandoval admitted to operating on the scientists in hopes of disabling their implanted tracking devices, but refused to implicate his boss, Bill Taggart. Pritchard then traced one of the scientists' signals back to China, sending Jensen and Malik scrambling to find him. Unfortunately, the conspirators are still one step ahead...

M1 - Cashing in Old Favors is a mission in Deus Ex: Human Revolution.

Meet Sarif in the Penthouse
This is a brief story-only mission between leaving Detroit for the second time and arriving back in Hengsha. It takes place entirely in Sarif HQ. There are a few additional messages to be found on terminals, and some previously hacked terminals have been locked again. Most of the area is unchanged from your previous visit.

Take the elevator up to Sarif's office to find Hugh Darrow waiting for you. After a brief exchange Sarif returns and talks to you briefly before sending you on your way.

There is a hidden storage area in a corner of helicopter pad locked by Level 5 security door, by that time you should be able to hack it. Inside there is some ammo and Ammo Capacity Upgrade, Shotgun Burst Upgrade.

Meet Malik at the helipad
Back downstairs, head out towards the helipad, stopping along the way to talk to Athene Margoulis in the cafeteria. Then just go to the helipad, talk to Malik, and it's off to Hengsha again.