A body plethysmograph box pressure transducer fails the electronic calibration check after multiple attempts. Which of the following should a pulmonary function technologist do? 1. Perform a biologic control test 2. Inspect the door seal. 3. Re-zero the box pressure transducer. 4. Perform a physical pressure calibration.

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A body plethysmograph box pressure transducer fails the electronic calibration check after multiple attempts. Which of the following should a pulmonary function technologist do? 1. Perform a biologic control test 2. Inspect the door seal. 3. Re-zero the box pressure transducer. 4. Perform a physical pressure calibration.