I noticed another document (How to add drivers to WinPE for Ivanti EPM OS Provisioning) had some discussions on the newer Thinkpad models and which drivers are needed to be pre-loaded in order for the PE environment to work. However I have spent 4 hours testing and researching the various drivers and have had no such luck getting any to work. Any help in which .inf files are needed would be great. We are using the 32bit format since we are using the legacy bios setups currently.
Also Lenovo support provided me these links to use these drivers and they still did not work:
WinPE Driver Packs