DHCPDECLINE question

[Darren]

Does anyone know what the server does with the lease (if exist) when it 
receives this message (all IPs have been changed to protect the 
guilty).  Further, does anyone know why a client would send such a message?:

Jul 12 21:09:52 dhcp-1 dhcpd: DHCPDECLINE of 192.168.0.139 from 
00:11:11:7b:83:da (BRENDA1) via 192.168.0.129: not found


Here is some context:

Jul 12 21:09:51 dhcp-1 dhcpd: DHCPDISCOVER from 00:11:11:7b:83:da via 
192.168.0.129
Jul 12 21:09:51 dhcp-2 dhcpd: DHCPDISCOVER from 00:11:11:7b:83:da via 
192.168.0.129: load balance to peer dhcp
Jul 12 21:09:51 dhcp-1 dhcpd: DHCPOFFER on 192.168.0.139 to 
00:11:11:7b:83:da (BRENDA1) via 192.168.0.129
Jul 12 21:09:51 dhcp-1 dhcpd: DHCPREQUEST for 192.168.0.139 
(10.10.10.10) from 00:11:11:7b:83:da (BRENDA1) via 192.168.0.129
Jul 12 21:09:51 dhcp-2 dhcpd: DHCPREQUEST for 192.168.0.139 
(10.10.10.10) from 00:11:11:7b:83:da via 192.168.0.129: lease owned by peer
Jul 12 21:09:51 dhcp-1 dhcpd: DHCPACK on 192.168.0.139 to 
00:11:11:7b:83:da (BRENDA1) via 192.168.0.129
Jul 12 21:09:52 dhcp-1 dhcpd: DHCPDECLINE of 192.168.0.139 from 
00:11:11:7b:83:da (BRENDA1) via 192.168.0.129: not found
Jul 12 21:09:52 dhcp-2 dhcpd: DHCPDECLINE of 192.168.0.139 from 
00:11:11:7b:83:da via 192.168.0.129: not found
Jul 12 21:10:02 dhcp-1 dhcpd: DHCPDISCOVER from 00:11:11:7b:83:da via 
192.168.0.129
Jul 12 21:10:02 dhcp-2 dhcpd: DHCPDISCOVER from 00:11:11:7b:83:da via 
192.168.0.129: load balance to peer dhcp
Jul 12 21:10:02 dhcp-1 dhcpd: DHCPOFFER on 192.168.0.149 to 
00:11:11:7b:83:da (BRENDA1) via 192.168.0.129
Jul 12 21:10:02 dhcp-1 dhcpd: DHCPREQUEST for 192.168.0.149 
(10.10.10.10) from 00:11:11:7b:83:da (BRENDA1) via 192.168.0.129
Jul 12 21:10:02 dhcp-2 dhcpd: DHCPREQUEST for 192.168.0.149 
(10.10.10.10) from 00:11:11:7b:83:da via 192.168.0.129: lease owned by peer
Jul 12 21:10:02 dhcp-1 dhcpd: DHCPACK on 192.168.0.149 to 
00:11:11:7b:83:da (BRENDA1) via 192.168.0.129