You are auditing ABC Company's calendar 2019 financial statements. You have completed all your field work by 2/28/20 and completed your audit reports on their financial statements. However, before the client issued them, you learned that a new product of theirs had a serious design flaw that that existed during 2019 and that ABC was probably going to incur much higher warrantee costs (i.e., large enough to be material) than they expected when you did your field work. What action should you take and why