IBM x iDataPlex dx340 Series Problem Determination And Service Manual page 148

8. Lift the power supply from the 3U chassis.
9. If you are instructed to return the power supply or the power-supply paddle
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System x iDataPlex dx340 Types 6385, 6386, 6389, 7831, 7832, and 7834: Problem Determination and Service Guide
card, follow all packaging instructions, and use any packaging materials for
shipping that are supplied to you.