Atrium H-719 part

A home owner from USA says:
I have a failed Atrium window and others that may go soon and have nailed the problem down to (I believe) failed nylon part:(H-719)Channel Balance Guide, 7/8",Product Code: 18-177

Is it possible that this breaking would allow my window to fall out?

I only have one failed window but I have seven windows that will soon follow suite and fail as well.

Can you suggest a feasible way to fix these windows without replacing them all? Would replacing these parts be a good start?
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Tom from SWISCO responded:
Hmmm... if the top sash guide broke, the balance would shoot straight up in the track. That could, in turn, cause the sash to fall out. Is that what happened? If so, I think replacing them would be a great place to start.
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