After initiating the SR, you would need to upload files such as, *.cpinfo, configurations, Interface detials, messages files etc, to the Check Point user center for, more investigation.
For that you need to have a Check Point account with the Service Contracts
Below are the steps for a upload from a windows PC
1) Download the cp_uploeyder from the user center
2) Extract the files to a directory
3) Open CMD and change the path to extracted folder
4) Copy the files needed to be uploaded to the same folder
5) Run below command
C:\cp_uploader> cp_uploader.exe -u <username> -s
28-899191931 <*.cpinfo>
<username> : User Center account
<*.cpinfo> : File you need to upload for the SR