PDF page corruption and replacement

I have a set of 7 PDF files which contain genealogy reference information that I use almost daily. Over the years, I have discovered errors or omissions in these documents, so I have been using the 'Add sticky note' function of Reader. Now I notice that on some of these documents, the first page (a title page) is missing information and reformatted. I saved original unmodified versions of each of these files. Is there a way to copy the first page of the original PDF and overwrite the first page of the corrupted file? I do not want to lose the sticky notes I have applied, nor do I want to mess up the original documents. 

Suggestions?

Thanks in advance, Rick.