Cisco did extensive study on the rework/design layout reliability  
study around 2010, i believe it is published by IEEE.  location of  
the rework and internal layout, such as other side components  
population and size of the board all play the role.  Sorry I don't  
have a copy, but you might be able to find it via IEEE ECTC  
conference proceeding (electronic components technology conference if  
my memory serve right, it should be in the 2009 to 2013 time zone)...  
good luck.
jk
On Dec 12, 2019, at 7:22 PM, Rivera, Raye wrote:

> Hello all,
>
> Can anyone point me to a study regarding the reliability of  
> reworked BGAs? As in what is the impact of removing and replacing a  
> BGA.
>
> Thanks in advance.
>
> Best regards,
> Raye Rivera
> Quality Manager