Look at your backup pdf. In their infinite wisdom, ProConnect has dropped those old years. If you don't have a backup contact support and the may be able to help you. 

I am not sure which of these links has the real story https://accountants-community.intuit.com/articles/1860748-printing-saving-pdfs-for-2009-2012-returns (hopefully) OR https://accountants-community.intuit.com/articles/1861045-faq-for-decommission-of-prior-year-tax-ret...