Juniper MX2010 Hardware Manual page 299

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5. Press and hold the latch a second time while inserting the fan tray completely into the router.
6. Tighten the two captive screws on the fan tray faceplate.
7. Close the fan tray access panel, and tighten the captive screws to secure it in place.
Figure 119: Reinstalling Upper Fan Trays
Figure 120: Reinstalling Lower Fan Trays