SFDC Sync - Failed: FIELD_INTEGRITY_EXCEPTION

Hi,

I sometimes encounter an error message: SFDC Sync - Failed: FIELD_INTEGRITY_EXCEPTION when trying to sync leads. I wanted to know if there is any option to create a report that will show me all the leads that were failed to sync from Marketo to SF.

I already have a report for new leads that were failed to sync ( I use the SFDC type is empty field) but how can I have a report that shows me existing leads that failed to sync?

Thanks