I140 amendment procedure for AOS to CP

SudP

Registered Users (C)
My I140 was files in Feb 2007 with AOS option and I need to change it to CP option.
My employer's legal dept is giving me a hardtime for amending I140 from AOS toCP.
They want to know what are the steps involved, I could not find anything on the internet that says about the the steps so wanted to see if anybody on this forum has any idea of it.

Thanks.
 
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