Issue
Change Lead Owner reason shows "Synched from salesforce.com - fixup Lead Owner."
Solution
The "synched from salesforce.com fixup lead owner" activity means the lead owner was switched within SFDC, often times through auto-assignment rules.
The phrase "fixup Lead Owner" is what Marketo records when it is taking the Owner ID being passed from Salesforce and translating it into the Lead Owner values (First Name, Last Name, Email Address, etc) to populate into Marketo.
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