Sp2 updates WinPE to version 5 which is based on Windwows 8.1. The default WinPE in LANDesk is the 32 bit one so if you havent changed anything then you need 32 bit drivers.
You mention video drivers but for WinPE you only need storage and network at most. The new WinPE has a very large driver store so I would test your hardware before adding any drivers as you may not need many if any.
Well, drivers came up because the first time I tried to image a computer off the network after updating, it gave me the following error
Your PC ran into a problem and needs to restart. We're just collecting some error info, and then you can restart. (0% complete)
If you'd like to know more, you can search online later for this error: VIDEO_TDR_FAILURE (igdkmd32.sys)
And my co-worker saw it and said I needed to embed drivers into the new system.
What I was talking about before was the WinPE drivers but you are talking about the final OS drivers.
Have a read of this doc to see how to use hardware independent imaging and this should resolve your issue.