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Costs could go up as much as 400% in some cases, according to NCRA.
NCRA says a 'vast majority' of mortgage lenders will incur price increases ranging from 10% to 400%.
The program is designed to expand the pool of potential homebuyers.
Complaint stems from errors in credit scores made earlier this year.
Coding issues affected about 12% of potential borrowers.
About 12% of customers may have been affected, according to a source.
