Reflash Back to Original WM5

[tapeworm]

I know its been covered, I've read the threads, and have even downloaded the original wm5, however, I need to take in my phone for service, and I want to make sure I am back to wm5. However, my screen is cracked! So I don't know whats going on in the screen!

Do I just run in and hope for the best? Can anyone walk me through it? I don't want to brick it, and I also don't want to leave it with wm6 and the roms all there, because I am sure the sprint techs won't like that. Any help is appreciated! Thanks in advance!