As Matthew states, if you are hearing air surging/whistling when you position plate cylinder and open clamp, only then is there a consideration to replace bladder/bag...but even then it is more common to find rotted air lines. And as far as sending you the instruction pages from the repair manual, it really won't be of much use as they are not "step by step" instructions. You must actually see the repair done by an experienced mechanic, and from there use the manual for reference. It would be impossible to type out the instructions on a platform such as this.