You need to keep the left part as it is, only the right part (the one with module.php) needs to be changed.
Example again :

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RewriteRule ^ftopic(t|p)-([0-9]*).html modules.php?name=Forums&file=viewtopic&$1=$2

becomes :

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RewriteRule ^ftopic(t|p)-([0-9]*)\.html viewtopic.php?$1=$2 [QSA,L,NC]

These two :

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RewriteRule ^forum-([0-9]*)-([0-9]*).html modules.php?name=Forums&file=viewforum&f=$1&start=$2
RewriteRule ^forum-([0-9]*).html modules.php?name=Forums&file=viewforum&f=$1

becomes :

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RewriteRule ^forum-([0-9]*)(-([0-9]*))?\.html viewforum.php?f=$1&start=$3 [QSA,L,NC]

This one :

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RewriteRule ^ftopic-([0-9]*)-([0-9]*).html modules.php?name=Forums&file=viewtopic&t=$1&start=$2

becomes :

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RewriteRule ^ftopic-([0-9]*)-([0-9]*)\.html viewtopic.php?t=$1&start=$2 [QSA,L,NC]

It's rather long to list them all, since many nuke RewriteRule are just useless, and other does rewrite url that do not need to be, but with these three, you'll be already redirecting forum, topic and post, pagination included.

Just add an s to your forum index in phpbb_seo_class.php to use forums.html instead of the default forum.html and you'll be properly handling the the forum index as well.

Of course, it would be better to local test all of this, but there si nothing difficult, patience and time is what you'll need the most to take care about all cases.

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dcz,

I am sorry I'm still not understanding...

here is an example..

http://www.google.com/search?q=site:htt ... t=320&sa=N

I want to redirect URL "modules.php?name=Forums&file=viewtopic&t=14807" to the new phpBB3 board...what code would I use??

I gave you the main rewriterule to use already, while explaining you how ot mod the others.
With :

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RewriteRule ^ftopic(t|p)-([0-9]*)\.html viewtopic.php?$1=$2 [QSA,L,NC]
RewriteRule ^forum-([0-9]*)(-([0-9]*))?\.html viewforum.php?f=$1&start=$3 [QSA,L,NC]
RewriteRule ^ftopic-([0-9]*)-([0-9]*)\.html viewtopic.php?t=$1&start=$2 [QSA,L,NC]

you'll be redirecting forum, post and topic, pagination included, as long as, of course, you set proper paths in your rewriterule (use the same one as the other one in your .htaccess).

++