If the manager(s) did not submit the review(s) to HR, before the review process was ended, the Admin will need to contact support (trinet.com/contact-us). Support will be able to revert the entire review process back to the stage before the review process was ended. Then, the manager(s) will be able to submit his or her reviews to HR. 

Before ending the review, please review the indications that a review has been submitted to HR help topic.