1142 APs LEDs not working in normal operation

Hi guys,
just installed 6 new APs to a client remote site off a 5508 controller. 5508 is running 7.0.116
total of 78 installed APs, mostly 1142's with a dozen or so 1242s
All going perfectly until I was about to leave site and noticed two of the APs had no LEDs lit.
Checked in the controller, as I had renamed them so knew they were on the system, and they are both there. Connected to each of them and was successful and everything seemed ok - no blue LED though. Rebooted them and the LEDs work as expected during the boot process but as soon as they have entered normal operation the LEDs go dark.
I have seen the following:
https://supportforums.cisco.com/thread/2177779
and
https://supportforums.cisco.com/thread/2186453
but no reports of it with anything other than 3502's...
Change process is galacial and heavily monitored so dont want to invoke it if it wont address the concern...
Any ideas will be gratefully accepted.

Hi Scott, and thanks for the reply,
So, the APs are getting a disable command from the controller at boot?
I just cant see why these two in particular should exhibit behaviour different to the others deployed, and it must be something to do with their interaction with the controller as the LEDs work correctly until after they become operational...
I am trying to understand what makes these two so special? Boss has said that they should be RMA'd as faulty without an adequate explanation for the peculiar behaviour...

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1142 APs LEDs not working in normal operation

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