Rockford Fosgate p1000x2

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So I started on a new amp today. And it had a few shorted components. 2 outputs., And two source resistors. Same koa 3watt 0.01ohm...?? Anyway the amp runs irf3415 and irf6218 -120v 27amp replaced the bank of 3415s and waiting for the other outputs. Ps is running. When I test the 3415's the new ones I got a diode reading across 1-3 of .568 and nothing on the forth (in the slot of the shorted one) any ideas what I should check. I been checking non, an pnp drivers through out the board and resistors for anything open or out of tolerence?
 

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Ok so I hooked it up and got 12.5v and only drew a small amount of current. Seemed like the ps fets we're faulty I'm.bot sure the driver's test good. I'll test the 494 pins 3-4 for voltage and see if it's high, maybe it's shutting off and on? Or should I just remove the retifiers and get the paperwork up and running isolated? mosfets Irf1404z
 
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