I don't know that any retention requirement is stated any longer. Back when we had correspondent reporting, 215.22(d) (as I recall) had a 3 year retention requirement.
Absent this, I would at a minimum go exam to exam.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell