Correct TSA Pre-Check Number in existing reservation

[kwatada]

Hello - I am trying to change my TSA pre-check number in an existing reservation. I accidently typed in the wrong number and realized after I submitted. When I attempt to change in the reservation, the field states, "on file" and won't let me change. Can you please help?! 

[franktravel]

You may want to add your TSA number to your profile in your Rapid Rewards account.  To change for existing reservation you have to call Southwest customer service.