[EricH]

And because that's a relatively tough rule to find...

Originally Posted by Section 7.3.5.2

<G42> ARENA Reset Delay - ROBOTS must release any portions of the TOWER, PLATFORM, or ALLIANCE ROBOT without power after a MATCH. Violation: YELLOW CARD.

Also see:

Originally Posted by Section 9.5.4

<T16> Field power to the ROBOTS will not be re-enabled after a MATCH.

Translation: be able to get at whatever is holding the robot up to remove it.