If they do, then they should first sue their insurance agent for not notifying them of a reduced premium.
I think you are interjecting the bank into the middle of something needlessly, unless you have since caused the borrower harm, i.e., force placed insurance in error.
There is absolutely no requirement for you to tell the customer that they have been mapped out of a zone just as there is no requirement for you to have completed a life of loan determination in the first place.
Let a sleeping dogs lie, or notify them now if you want to open that can of worms.
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