Hey, I've been looking for a specific episode, but my lack of knowledge as to what happens in it, has made it quite hard to find it via google, so I'm hoping I'll have more luck here 
All I remember from this one episode, is that Dr. Crusher is training to be able to take the Bridge's night shift, or something. In her training she is in a simulated scenario on the holodeck, and something in the ship it wrong that must be fixed, unless the Enterprise is to explode. She keeps failing the test, untill she finally realises that she has to sent LaForge in to fix the problem, though he will without a doubd not come back alive.
Hope somebody can help me out.
Thank you for your time

All I remember from this one episode, is that Dr. Crusher is training to be able to take the Bridge's night shift, or something. In her training she is in a simulated scenario on the holodeck, and something in the ship it wrong that must be fixed, unless the Enterprise is to explode. She keeps failing the test, untill she finally realises that she has to sent LaForge in to fix the problem, though he will without a doubd not come back alive.
Hope somebody can help me out.
Thank you for your time