Change state of a Change Request to Review state when Downtime is set to Yes

Question

I want to change the state of a Change Request in ServiceNow from Implement to Review using an API call from a python script. This is working if the DownTime is No, but if it is yes I am not able to change the state as it requires us to update Actual Downtime start and Actual Downtime end values.

Manual Process -

1. Click on Review
2. Update Actual DownTime Start and Actual DownTime End(These fields are disabled until the Review button is clicked)
3. Click Save

How can I replicate this through API?