Juniper MX2010 Hardware Manual page 551

For more information about the command, see the
Reference.
NOTE:
the FRU gets power, and the system's total power decreases.
CAUTION:
removing the MPC again, removing an MPC from a different slot, or inserting
a MPC in a different slot.
You can also verify that the MPC is functioning correctly by issuing the show chassis fpc and
show chassis fpc pic-status commands.
Figure 279: Installing an MPC into an Adapter Card
When you issue the request chassis fpc slot slot-number online command,
After the OK LED turns green, wait at least 30 seconds before
Junos OS System Basics and Services Command
535