[Technoprint]

Heres a bit more info, I noticed it came up with Degraded on the front panel, so checked the log:

2009/06/27 07:04:00 N5200 : [Disk sda] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/27 07:04:00 N5200 : [Disk sdb] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/27 07:04:00 N5200 : Assemble RAID [md1] from [ /dev/sda2 /dev/sdb2 ]
2009/06/27 07:04:00 N5200 : mdadm: /dev/md1 has been started with 2 drives (out of 3).
2009/06/27 07:04:00 N5200 : [Disk sda] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/27 07:04:00 N5200 : [Disk sdb] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/27 07:04:00 N5200 : Assemble RAID [md1] from [ /dev/sda2 /dev/sdb2 ]
2009/06/27 07:04:00 N5200 : mdadm: /dev/md1 has been started with 2 drives (out of 3).
2009/06/27 07:04:05 N5200 : N5200 boot
2009/06/28 03:00:03 N5200 : [ Quota ] Folder [ MAC_BACKUPS ] add to Quota Management.
2009/06/29 03:00:03 N5200 : [ Quota ] Folder [ MAC_BACKUPS ] add to Quota Management.
2009/06/29 08:36:59 N5200 : [Disk sda] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/29 08:36:59 N5200 : [Disk sdb] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/29 08:36:59 N5200 : [Disk sdc] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/29 08:36:59 N5200 : Assemble RAID [md1] from [ /dev/sda2 /dev/sdb2 /dev/sdc2 ]
2009/06/29 08:36:59 N5200 : mdadm: /dev/md1 has been started with 2 drives (out of 3).
2009/06/29 08:37:04 N5200 : N5200 boot
2009/06/29 08:38:59 N5200 : User admin logged in from 192.168.16.41
2009/06/29 08:56:07 N5200 : [Disk sda] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/29 08:56:07 N5200 : [Disk sdb] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/29 08:56:07 N5200 : [Disk sdc] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/29 08:56:07 N5200 : Assemble RAID [md1] from [ /dev/sda2 /dev/sdb2 /dev/sdc2 ]
2009/06/29 08:56:07 N5200 : mdadm: /dev/md1 has been started with 2 drives (out of 3).
2009/06/29 08:56:07 N5200 : [Disk sda] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/29 08:56:07 N5200 : [Disk sdb] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/29 08:56:07 N5200 : [Disk sdc] UUID[raid5;8f34dd4c:389cf8c2:20550d44:a828ba47;Mon Apr 14 20:21:54 2008]
2009/06/29 08:56:07 N5200 : Assemble RAID [md1] from [ /dev/sda2 /dev/sdb2 /dev/sdc2 ]
2009/06/29 08:56:07 N5200 : mdadm: /dev/md1 has been started with 2 drives (out of 3).
2009/06/29 08:56:11 N5200 : N5200 boot
2009/06/29 09:06:31 N5200 : User admin logged in from 192.168.16.41

Also checked the discs:
Tray Number 1
Model HD321KJ
Power On Hours 10371 Hours
Temperature Celsius 37
Reallocated Sector Count 0
Current Pending Sector 0
Raw Read Error Rate 0
Seek Error Rate 0
Hardware ECC Recovered 2469435

Tray Number 2
Model HD321KJ
Power On Hours 10419 Hours
Temperature Celsius 39
Reallocated Sector Count 0
Current Pending Sector 0
Raw Read Error Rate 0
Seek Error Rate 0
Hardware ECC Recovered 1125252

Tray Number 3
Model HD321KJ
Power On Hours 10420 Hours
Temperature Celsius 37
Reallocated Sector Count 0
Current Pending Sector 0
Raw Read Error Rate 0
Seek Error Rate 0
Hardware ECC Recovered 915750

I'm not very experience when it gets this far, but I take it the log is telling me one of the drives is down, but they all say status is OK.

Any help would be greatly appreciated