Are you talking "Observation" or "Non-conformance"? 2 totally different things, one is a duck and the other an apple.
I'm an auditor and right off the top I don't care if you do anything with "Observations" because there's no requirement that you do so. Observations are for the most part opinions and my opinion doesn't count squat.
Next, a Non-conformance requires corrective action, and effective corrective action is a time based process. For effective corrective action you've got to review the problem, come up with some type of cause determination, apply some type of short term fix, develop a long term fix, implement the fix, and verify that the fix works over time.......while at the same time checking to see if you have any other similar problems that need fixing.............and you ain't honestly going to do that between 8:30am and 5:00pm. Regardless, fixing it or not during the audit, it's going into the report and to do otherwise is dishonest.