66(5)In an action for a deficiency, the debtor may raise as a defence the failure of the secured party to comply with obligations in section 17, 17.1, 18, 59 or 60, but non-compliance shall limit the right to the deficiency only to the extent that it has affected the debtor’s ability to protect the debtor’s interest in the collateral or has made the accurate determination of the deficiency impracticable.