Let me help, the key is knowing what they will ask you for!
Product : What kind of SZ - SZ300 / SZ100 / vSZ
Serial Num: They will ask...
SW Version: Important, since you didn't see the problem till upgrade
Logs: Can you get logs from this Zone in advance?
If you have this ready, they may just need to open a ticket for you, send you a greeting msg with the case number, and you can reply back with your logs for them to go thru, search for bugs, etc.