2009 Nissan Altima problem

I am working with a girl that has a 2009 Nissan Altima. It has developed the transmission problems every one on this forum has described. I just want to know how I can be proactive and prevent a problem before it develops.
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How many miles are on the car?
You say it has developed the problem everyone has described. Yet you then say how to be proactive and prevent a problem??? I dont understand?