[MCBear]

Posted by pavbref:
In the following question, the correct answer is B which states that no line-up check is permitted:

The first referee authorizes service but before S1 can serve the ball, an errant ball enters the court. The referees whistle to stop the service action. Which of the following requests are permitted before the first referee re-authorizes the serve?

A - Either team may request a lineup check.
B - No requests (lineup check, timeout or substitution) and no libero replacements are permitted until the next time the ball is out of play.
C - Either team may request a substitution.
D - Either team may request a timeout.

Sorry, oldsetter, the correct answer in this situation is "B". Per Rule Interpretation Newsletter #1 from 2010:

The first referee authorizes service (beckons) but before S1 can serve the ball, an errant ball from another court enters the playing area and creates a safety hazard. The referees whistle to stop the service action. The Team S coach requests a lineup check before the next authorization for service.
Ruling: After an authorization for service, there can be no requests (timeout, substitution or lineup check) or a libero replacement until the next time the ball is out of play. If the next out-of-play ball occurs as the result of a completed rally, all requests are allowed at that time. If the next out-of-play ball occurs after play that is not a completed rally, a lineup check would be allowed, but no other requests or libero replacements would be permitted.

Hopefully that clarifies when a line-up check is and is not allowed in these types of replay situations.