The Musicnotes site has the sheet music. There's preview (you may have to install the Sibelius Scorch software).
I don't know if the bass line is accurate, but I'd tend to believe the chord structure is.
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Praise & Worship #505, Sansamp VT Bass Owner's Club #39, U.S. Peavey Club Member #160
for the bassline? do you use GuitarPro? I find it a nice tool for such things. I think I used this GPR file for Working for the Weekend. It does follow the guitar closely.
if you don't have GPR, I think there are a number of places where it can be downloaded for free. I have to admit that I've found it invaluable, although you cannot always find GPS tabs for songs you want to do and in many cases ones there are incorrect, but that's true for any tab format.