11/45 revisited

I was looking at the power control board for the H742A (5409730) that is supposed to be putting out my +15v. I couldn't find any schematics on this board but the system engineering prints appear to indicate they should be present. In the absence of schematics (and any obvious scorching) I figured the likely first thing to check is the sole TO-3 power transistor on the board. Sure enough, the C-E junction is shorted so at the least I'll need one of those. 1) The critter is Motorola "DEC3000" which I'm betting is a DEC house part number (since ECG xref shows nothing && it starts with DEC). Can anyone clue me in to what part that really is? 2) Are the schematics for 5409730 around so I can try to understand it a little better? Thanks for any pointers! Jay West