Issue in image pre-download

Hi.
I tried to need upgrade firmware of WLC to 7.6.00.To avoid long hour outage, I was using image pre-download firmware upgrade method to all access points.There are 99 AP in total & one site has issues 5 Aps. There are 13 x 3600 APs in this site. Out of 13, 5 x APs are not able to push new firmwareFrom my troubleshooting, I found that when I start pushing new firmware to AP, Secure tunnel between WLC and AP drops.
Please guide me to resolve this issue.
Thanks

Hi Scott,
Please see below output
show flash:
Directory of flash:/
    2 -rwx       70825 May 29 2013 02:18:31 +00:00 event.log
    3 drwx           0   Mar 1 1993 00:00:12 +00:00 configs
    4 -rwx         280 Apr 24 2014 05:17:21 +00:00 lwapp_officeextend.cfg
    5 -rwx       29996 Apr 28 2014 13:24:13 +00:00 lwapp_non_apspecific_reap.cfg
    6 -rwx       95008 Apr 24 2014 05:17:24 +00:00 lwapp_reap.cfg
    7 drwx         832 May 29 2013 00:23:41 +00:00 ap3g2-k9w8-mx.152-2.JA1
   46 -rwx          64   Mar 1 1993 00:00:34 +00:00 sensord_CSPRNG0
    9 drwx         192   Dec 4 2012 05:00:01 +00:00 ap3g2-rcvk9w8-mx
   47 -rwx          64   Mar 1 1993 00:00:35 +00:00 sensord_CSPRNG1
   48 -rwx         230 Apr 24 2014 05:17:20 +00:00 env_vars
   49 -rwx       60760 Apr 24 2014 05:14:40 +00:00 event.capwap
   51 -rwx        7192 Apr 28 2014 14:04:59 +00:00 private-multiple-fs
31997952 bytes total (13533184 bytes free)

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