Go out into the corridor. After a while, you will find out that pointless wandering does not make much sense. Rufus will only wander around, unable to find the right door. Return to the room. Click the button on the cover next to the door. Take a coffee cup from the vending machine. Click on the air duct. You will reach the shaft above the correct room. Spread coffee on the carpet under the shaft - a cleaning robot will appear. Return to the cabin, go out into the corridor and pour coffee on the carpet in front of the cabin. The mess will lure the robot again. Place the coffee cup of on top of it and punch the cup with the letter opener. Take another coffee cup from the vending machine and use the shaft to reach the processor room. Pour coffee on the carpet there, and when the robot arrives, pour coffee into the cup it carries. Go back to the cabin and follow the robot's footsteps.