Try this link. Might give you some information as to what MIBS (and where to find them in the MIB Tree) to use.
http://www.oidview.com/mibs/14823/WLSX-SWITCH-MIB.html
Also some useful MIBS,
1.3.6.1.4.1.14823.2.3.1.11.1.2.1041 - Access point is down
1.3.6.1.4.1.14823.2.3.1.11.1.2.1040 - Access point is Up
1.3.6.1.4.1.14823.2.2.1.5.2.2.1.15 – Associated clients details
1.3.6.1.4.1.14823.2.2.1.5.3.1.1.1.2 – Number of clients of an Ap
1.3.6.1.4.1.14823.2.2.1.1.3.5.1.2 - Total Current Channel Bandwidth (kbps) per AP
1.3.6.1.4.1.14823.2.2.1.1.3.5.1.12 - Total Bandwidth per AP BSSID (kbps)
1.3.6.1.4.1.14823.2.2.1.1.1.11.1.4 - Free Memory , CPU utilization
1.3.6.1.4.1.14823.2.2.1.1.3.1 - Number of Current APs per Controller
1.3.6.1.4.1.14823.2.2.1.1.3.4.1.6 - Number of Down APs per Controller
I have not tried them with the 8.5 version but it should be more or less the same.
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