How to Replace Power Supply

I'm stuck with what I thought was going to be an easy job - compared to a G5 tower or an iMac.
I need to replace the power supply in my Mac Pro (2008) but I'm stuck at getting the small cover off. I've removed the metal plate that was under the optical drives (POV when looking through the side). But it seems there's a small cover for the power supply that's similar to the big processor cover for the liquid cooled G5 towers. I can't figure out how to remove that.
Does anyone have a link to a manual or take-apart guide for the Mac Pro?
Thanks!

Before you begin, open the computer, lay it on its side with the access side facing up, and remove
the following:
• Hard drives and hard drive carriers in drive bays 3 and 4
• Optical drive carrier and optical drives
• Any PCI Express cards that block access to the power supply mounting screws
1. Using a short-handled, magnetized 2.5 mm hex screwdriver, remove the four power supply
mounting screws from the bottom of the media shelf.
2. Depress the upper right corner of the power supply and slide the power supply toward the
front of the computer.
3. Lift the power supply a short distance and rest it on the edge of the enclosure.
4. Starting with the top connector and working down, disconnect the four connectors on the
power supply cable from the four connectors on the power harness cable. Note: You must release the locking latch on each power supply cable connector before detaching the connector.
5. Remove the power supply from the enclosure.
Replacing the Power Supply:
1. Rest the power supply on the edge of the enclosure so that its cable can reach the media
shelf divider. Note: The following four steps explain how to reconnect the power supply cable connectors with the power harness connectors. When the power harness connectors are in their original position in the media shelf divider, it is not possible to see where they mate with the power
supply cable connectors. Therefore, the next step shows how to temporarily remove the power harness connectors from the divider for a better line of sight.
2. Starting with the top connector and working down, release the four power harness cable
connectors from their openings in the media shelf divider. Note: Each connector has two locking latches that hold it to the divider. To release the connector, depress the bottom latch first and then the top latch. You may find a flat-blade screwdriver useful in depressing the latches.
3. Placing a hand on either side of the media shelf divider, thread the J1 connector on the power supply cable through the top connector opening in the media shelf divider and connect it to the PS1 connector on the power harness. Repeat for the other three power supply cable connectors.
4. Important: The first three connectors on the power supply cable are marked J1, J2, and J3; the fourth connector is not marked. The four connectors on the power harness cable are marked PS1, PS2, PS3, and PS4. You must connect J1 to PS1, J2 to PS2, etc.
5. Starting at the bottom connector and working up, depress the locking latches on each power harness connector and reinsert it into its opening in the media shelf divider. Important: Test that all power supply cable connectors and power harness connectors are fully seated by tugging on the cables on both sides of each of the four paired connectors.
6. Fold the power supply cable on the bottom of the power supply bay.
7.Lift the power supply and holding the power supply at an angle, llower it into the enclosure until its
upper right corner slides under the corner lip of the enclosure.
8. Slide the power supply toward the back of the computer as far as possible.
9. Make sure the power receptacle aligns with the opening in the enclosure’s back panel and
the four screw holes in the power supply align with the screw holes in the media shelf.
10. Replace the four power supply mounting screws.

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