Hi Greg:
Here's the link to the MP3 repair utility again:
http://www.drtag.de/en/description_mp3rt.htm
Also, you might try opening your large MP3 in MP3DIRECTCUT, then re-saving it as a new file with a different name. Might be worth a try.
http://www.mpesch3.de/
BTW, there are known issues of WavePad handling files longer than one-hour. There are several posts in this forum about that problem, with some tips for working around it.
Jerry