The transmission solenoids are located under the side cover of the transmission. The side cover comes off with the transmission still in the car, but it's quite a job, especially if you don't have a lift.
Injuries or conditions that affect the chest wall -- the rib cage and associated muscles -- are another common cause of pleuritic chest pain. Chest muscle strain due to strenuous exercise may cause pain experienced primarily with deep breathing. Vigorous activity can also lead to costochondritis, a condition involving inflammation of the connective tissues of the rib cage.
While shallow breathing can cause shortness of breath and anxiety, deep breathing slows the heart rate and stabilizes blood pressure. It's a great technique to use when you want to decompress and lower your stress level. See Step 1 to learn more about how to get in the habit of breathing deeply from the belly.