I have done a comparison of 1.6 to 1.7 and marked issues that I found. I have marked them as either "Minor", "Medium", or "Major".
I did research for each issue and added info I found. I also included a list of "Fix options". I hope this is helpful to determine the best course forward and to implementing the fixes correctly.
I'm posting an FDF (and the corresponding PDF, since it is a recent draft–the FDF will work a lot better with the attached PDF than with some other draft).
I will open another JIRA issue with nits found during this process.
I have fully completed my comparison of 1.6 and 1.7.