WNDAP360 Boot loop

While I appreciate that the WNDAP360 is end-of-life, we're still using these access points at a school with a WC7520 wireless controller.  One of the APs appears to be stuck in a boot loop.  When powered, I can see the following:

• Power light - solid orange
• Activity light - solid green
• Network light - solid green
• 2.4 GHz light - off
• 5 GHz light - off
• The reset button clicks but has no effect.
• The AP is not pingable by either it's previous (static) IP address or the default IP address.
• Attaching a console cable, the following text is repeatedly displayed every 5 seconds:

U-Boot 1.1.4 dni-1.07 (Jul 7 2009 - 14:17:28)

AP94 (ar7100) U-boot 0.0.12
DRAM: b8050000: 0xc0140180

It almost looks like the reset is stuck on!?

I can find anything on the Community describing this particular problem.  Can anyone offer any advice on how to recover the access point?  

Thanks,

Adrian.