Have you tried factory defaulting this AP, with it's cable attached (as you don't have Mesh enabled on the ZD), and see if it can get re-configured, and here's the latest 7982 AP User Guide to see what the LEDs mean. From Support, Products, Indoor APs, 7982, Docs, here's the Solo AP 220.127.116.11.194 User Guide URL:
The 7982 details begin on page 42, and page 43 has the LEDs and their meanings. Here's the AIR LED specifics:
•Off: The AP is operating in standalone mode or operating as a root AP (RAP) or a non-mesh AP. •Green: The AP is functioning as a Mesh AP (MAP), and the wireless signal to its uplink AP is good. •Fast flashing green (two flashes every second): The AP is functioning as a Mesh AP (MAP), and the wireless signal to its uplink AP is fair. •Slow flashing green (one flash every two seconds): Mesh networking is enabled, but the AP is still searching for a mesh uplink.