Formulas giving unexpected errors

Hey all,

A while back you guys helped me start a spread sheet for work, in which I'm still eternally grateful!

Now, I've added a few things to fine tune it to how I need it to work. But, I'm hoping that one of you gurus will look it over and dot the i's and such.

I'm getting a few small errors. In particular is the area of R/T 3-8. And F25.

I really appreciate all you guys help more than you can possibly know.

Thank you!