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Try using Meshlab. It's a great tool and should find any problems with your mesh in PLY format. It supports almost every format out there, except for native software file types, like .ma, .max, etc. It supports PLY files by default natively, as the software was written specifically to convert PLY files and work on the geometry in that format.
I don't know if the forum will allow me to post a direct link, but here's the website where you can download MeshLab. Again, it's great for PLY files and will allow you to edit the mesh directly. If there's a problem with your code, it should give you a message when you try loading it. www.meshlab.net
If your file is ASCII format PLY, then Meshlab should still open the object and allow you to resave as Binary. There used to be a very old software called PLY tools too, which supposedly helped format PLY code, but I don't' know if it still works on a modern OS, or where to find it now.
