What do you mean by "support requests"?
Assuming 3 broad buckets:
- "How do I do x?" type questions
- "This isn't working right" (i.e. a defect)
- "It would be really helpful if it did y." enhancement requests
Within each of the categories (you may have more or less than 3, but 3 is a good number to work with), assign some tags that categorize the request. I like to organize the categories as labels for vertical columns, and put a 'flag' for each request in the column. This give a quick and dirty vertical bar chart, and I almost guarantee you'll see a Pareto ratio emerge, wherein 20% of the 'tags' result in 80% of the requests. Now your PO can prioritize among/across the 20% of each of the 3 broad buckets, knowing that they are the high-value ones.
You can keep this as a running exercise.