We have a WLC 5508 that we use for mobility product development and customer demos. When I insert a SFP (GLC-T) in any of the 8 slots the LED blinks amber a couple of times and then stays solid amber. According to the manual this means "present with failure" though I cannot tell what exactly has failed. I have verified that the SFPs work when inserted into a 2960. I have also tried different ethernet cables, rebooted multiple times (everything comes up OK on the bootup process) and have run every possible show command there is including show tech. nothing gives any clue. The port reports that the SFP is inserted (at records remove and insert in the logs) but that it is "line down".
Any tips on how I can find out what is actually failed on the controller?