Hi Tim,
See this snapshot of the way to earn PDUs Page.
"Do Your Job: When you practice project (project scheduling, risk, or program) management professionally, you can claim PDUs. If you work every day as a project manager, this counts toward credential maintenance.
All activities must be related to project management topics that are substantially consistent with the Knowledge Areas and processes outlined in the latest edition of A Guide to the Project Management Body of Knowledge (PMBOK®Guide) and involve appropriate expert resources."
The link to that page is:
www.pmi.org/Certification/Ways-to-Earn-PDUs.aspx
Hope this helps.