Hello, I have a 1534 and recently ports 21 and 24 show a solid amber LED, and ports 21 through 24 do not function (22 and 23 have no light, but do not work either). I am testing this on a bench, not connected to anything but power and plugging in a cable into each port and testing for connectivity. The manual does not mention an amber light for the Link/Activity LED, though I do think it is common to blink amber for activity. But I have not seen a solid amber LED, especially with no cable attached. Any suggestions would be appreciated.