The verification procedure for the 3458A using a 57XXA calibrator has been removed from the Fluke Warranted Procedures download page. This procedure was referenced in two application notes, one written for a 5720A-based procedure and one about a 5730A-based procedure. After a review of the methodology by Fluke metrologists it was decided that the technique discussed was not up to current warranted procedure standards.
Guidance for this type of verification using a more proven method can be found in this white paper:
Calibrating Precision Multimeters