According to AHA Coding Clinic Second Quarter 2020, what code is assigned for stapling a Zenker’s diverticulum?

According to AHA Coding Clinic Second Quarter 2020 page 25, what code is assigned for stapling a Zenker’s diverticulum? (2 points) Why is a percutaneous endoscopic approach value assigned? (3 points)
According to AHA Coding Clinic First Quarter 2019 page 10, how is a coder to indicate recurrent pneumonia in a patient with AIDS?