change a 3 in hexcode file to a 2

I have an eprom hexfile that calculates yields on fixed income securities in our yield calculator. See One of the functions calculates a "Settlement Date", as of the coming September 5 2017, the settlement date calculation will change from 3 days to 2 days. The source code written in Quick basic was lost 15 years ago. I have the code in Visual Basic and in Visual Basic the change is simply changing a 3 to a 2. I need to find a way to change the correct 3 to a 2 in the hex code.

Skills: HTML, PDF, PHP, Software Architecture

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Project ID: #14077574

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