The guide is here.
Since it doesn't have audio tracks, there isn't really that many possibilities.
1. You have an alternate version. Since the size matches perfectly, it might not have EDC (db does). Check for this by using psxt001z.
Use it by going to the command line, navigating to your folder, and typing:
psxt001z.exe "file.bin"
Where file.bin is your image's filename. If you're unfamiliar with using the command line, put the following in a .bat file:
psxt001z.exe "file.bin" > log.txt
You can see the output in the resulting log file. What you're interested in is "EDC in Form 2 sectors". It's also very handy to know how to do this, since this tool will save you time by automatically checking the EXE date, ID, and EDC for you.
If your disc doesn't have EDC, that means it's a new dump! 
2. Your drive introduced "minor errors" that don't halt the dumping process.
To check for this, scan your dump with CDMage (run as admin if you have UAC enabled). Open your image file and select image type "M2/2352". Once it's loaded, go to action>scan for corruption and hit enter. Make sure "error log" is checked under view.
If you do have errors, try dumping it again or in another drive.
3. The dump in the db is bad
This doesn't seem too likely, since the db dump has 0 errors. My GH20NS15 has given bad dumps with "0 errors", though. That's why I always dump in multiple drives.
