I have Altitude 350-2i & Altitude 350-2d WAPs & Summit WLAN controller WM 200 installed in my Institute.. The software version of the controller is Software: V5 R1.10310.3. IThe system is working fine for last six years but recently what we have observed that some of the access points are not working. When we supply power to them only cental LED will start blink Green. Can any body suggests me a way to make those APs operational.