I am interested to find out how much it cost to change a revision on a
     PCB.  Here is the situation:  A PCB is in use on a product already in
     production.  Say an item on the fab drawing needs to be changed - one
     that does not affect form, fit, function.  Some here believe that any
     drawing that has left the building needs a rev change.  I'd heard once
     in a seminar that to change artwork on a board in production could
     cost from 25K - 250K.  Is this so?
     Any input is appreciated.

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