Changed both instances of the word should to must.
Replaced 5V6 zener with 431 driven PNP clamp circuit, configured for activation at 5.15V to allow 0.35V of schottky diode drop under fault conditions.
Changed note regarding resistor tolerances to read 0.1% instead of 1%.
Changed TIP42C PNP transistor to MJD127G PNP transistor, as TIP42C does not come in an SMD package.
Reconfigured Vref on TL-431 to set it at 5.15V. Removed zener text label underneath 47uF capacitor value. Removed G from MJD127 PNP transistor part designator. Corrected note regarding resistor tolerance. Corrected note regarding resistor tolerance.
Updated PDF to reflect latest Altium Schematic's.