The errata doc is current and I am posting the changes here as just the update.
I had changed the way I rigged the spine for the example file and simply forgot to update and clean up this part of the chapter.
Here is the fix to match the down loadable final character.
Chapter 7: page 134, paragraph 4, step 2:
change “”Auto Parent Curve off and Number of spans set to 2.”” to “Auto Parent Curve off and Number of spans set to 3.”
Chapter 7: page 135,
change ”Name the curve “ctrl_chest” and zero out its translation. Then parent the control curve shape node under the “ctrl_chest.
To ”Rename the joint "ctrl_spineChest" to "ctrl_chest". Then parent the control curve shape node under the "ctrl_chest".
change “orient-constrain “spineChest” to “ctrl_chest.” to “orient-constrain "bn_spineChest" to "ctrl_chest"
Chapter 7: page 136,
Step 15. - Because our FK spine controls are the parent of the upper "ctrl_chest" you are always in a mixed state of IK and FK, when the ctrl is zero, you can FK rotate the spine joints and the "ctrl_chest" and the rig is in FK mode. but at any taime you can choose to translate the "ctrl_chest" and are now in IK mode for the back, if you want pure FK gain you can zero the "ctrl_chest" and your blended back to pure fk.
Step -16 ignore/delete