Today I needed to re-run a task sequence and found the blog post in the following link.
http://www.scconfigmgr.com/2014/03/11/re-run-task-sequence-tool-1-0/
First we need to download the tool from TechNet
https://gallery.technet.microsoft.com/ConfigMgr-2012-Re-run-Task-72250d97
1. Open an elevated PowerShell console and browse C:\MyScripts.
2. Run the following command:
.\Start-TSRerunTool.ps1
3. Type the PackageID of the Task Sequence in the "PackageID" field and click search
4.Click the WIM object and delete it
5.Click Restart Agent button to restart the SMSAgent service