Final answer:
Raising the drainage collection device above chest level while monitoring a chest tube is the incorrect action requiring correction, as it could lead to ineffective drainage or backflow.
Step-by-step explanation:
The action of the co-worker that indicates the need for correction while monitoring a chest tube for a patient with a pneumothorax is raising the drainage collection device above chest level. For the chest drainage system to function correctly, gravity plays a crucial role in ensuring fluid and air flow out of the pleural space, so the collection device must be kept below the level of the chest. Elevating the device above the chest could lead to backflow or ineffective drainage.