Salesforce Objects Sync

I'm trying to sync Case data from Salesforce to Marketo. This sync was working several months ago, but the business need fell off and it is back again. Data is no longer syncing and when I navigate to the Case sync it appears that there is an error. There is not an option to Disable the Sync and retry. I have also tried Refreshing Schema with no luck. Anyone have any ideas for how to successfully get this data back into Marketo?

Thanks!

Amanda