Years ago I attended Ralph Woodgates "Zero Defects Soldering 
     Seminar" in which he stated that rework/touchup on solder 
     joints can degrade them.  He also stated that solder joints 
     that have been reworked are inclined to fail before joints 
     that have not been reworked.  You may want to contact Ralph 
     Woodgate for more detail on tests run in the past.  His 
     offices were in New York.  I am not sure of his number or 
     fax.  There are probably some TechNetter who still have his 
     number.

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