The second quest he gives is finding the Combination. During your Reign of terror on volkov you blew up there database and the only backup they have is in the hands of an ex employee who wont give it and has the lock combination.
Head to The Maze in Newisle and talk to Jimbo he will throw you into the maze and you must get to the end of the maze and remember the locker combination.
Once you retrieve the locker combination head back to Will to complete the quest.
You are allowed to /tumbleweed out of the maze if you get lost but the quest will be on a 2 hour cooldown