R510 AP one of two is not working. PWR light on the front panel stays red after power cycling. Unleashed app shows the AP as offline. I have unplugged the POE and plugged it back in with no change. I have also tried holding the reset button for 45 seconds using a paper clip - PWR light continued to persist as red. I removed the AP and tried a different Ethernet cable along with 12V adaptor with no success. The second R510 is connected and working.