Jerry I have the exact same issue. Cannot map or manage 3702 series AP's in PI because PI 2.0 cannot see them. After checking this thread and then reaching out to my Cisco SE, the "official" answer I got is; if you are running PI 2.0 you will have to wait for PI 2.1 to get PI support for WLC code trains 7.6 and higher. This will also fix the visibility issue with the newer series AP's. However that 2.1 train of PI is still in roadmap and supposedly will release sometime in May or June of 14'.
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