For those who are interested, here is Scott's response  on doing the 
job.  I tried it and it worked fine.

73,

Dave, W7OQ


>From: Scott & Kimberly Davis <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: Changing PH to CW in Field Day Log
>
>
>Hi Dave,
>
>Thanks for your e-mail.  The easiest approach will be to export your 
>log in ADIF, do a find and replace and then import it back.  I have 
>more details here:
>
><http://www.n3fjp.com/faq.html#q63>What is the easiest way to 
>perform bulk or global edits to all my records at once?
>
>Please let me know if you have any questions.
>
>Thanks for your kind words on the software!
>
>73, Scott
>N3FJP
><http://www.n3fjp.com>http://www.n3fjp.com
>
>Serving the Amateur Radio community with contesting and general 
>logging software since 1997.
>
>1 Peter 3 vs 15: Always be prepared to give an answer to everyone 
>who asks you to give <http://www.n3fjp.com/Faith.htm>the reason for 
>the hope that you have. But do this with gentleness and respect...
>
>
>
>
>-----Original Message-----
>From: Dave Basden <[log in to unmask]>
>To: snkdavis <[log in to unmask]>
>Sent: Mon, Jul 25, 2016 4:23 pm
>Subject: Changing PH to CW in Field Day Log
>
>Hi Scott,
>
>I was asked to send a summary sheet for my 2016 Field Day submission,
>which I sent off shortly after the contest. In examining the log, I
>discovered I had failed to change the mode to CW and all of my log
>entries are shown as PH. Is there a way to change them globally or
>will I have to do them one-by-one? I was hoping I could use
>something like Notepad to search for and replace PH with CW. What do
>you recommend? Incidentally, I am one of your devoted blind users.
>
>73,
>
>Dave, W7OQ