identifying failing disks

 This is not a question I'd normally bring up here but I'm a bit stuck as
a) the machine in question is in another country and b) the only access I've 
got to it is by getting someone who knows nothing about tru64 to type in
whatever I tell them and email it to me. The system is an AS800 with a BA356
disk array (7 disks apparantly), runing 4.0B. From what I've been able to 
gather from the uerf output I can see (relevent bits only posted)
MESSAGE                                 Alpha boot: available memory from
                                         _0x19d8000 to 0x3ffce000
                                        Digital UNIX V4.0B  (Rev. 564); Sun
                                         _Mar 19 14:55:20 WET 2000
                                       scsi0 at isp0 slot 0
                                        rz1 at scsi0 target 1 lun 0 (LID=0)
                                         _(Quantum XP39100W         LXTA)
                                         _(Wide16)
                                        rz4 at scsi0 target 4 lun 0 (LID=1)
                                         _(DEC     RRD46   (C) DEC  0557)
                                        Initializing xcr0.  Please wait....
                                        xcr0 at pci0 slot 13
                                        re0 at xcr0 unit 0 (unit status =
                                         _ONLINE, raid level = 5)
                                         (WRITE BACK cache operation SUPPORTED
                                         _if battery backup enabled)
                                        re1 at xcr0 unit 1 (unit status =
                                         _CRITICAL, raid level = 5)
                                         (WRITE BACK cache operation SUPPORTED
                                         _if battery backup enabled)

...which worries me slightly. There then follows entries in the log at 
roughly 10 second intervals as such:
----- EVENT INFORMATION -----

EVENT CLASS                             ERROR EVENT
OS EVENT TYPE                  199.     CAM SCSI
SEQUENCE NUMBER                  2.
OPERATING SYSTEM                        DEC OSF/1
OCCURRED/LOGGED ON                      Sat Nov 18 13:06:01 2006
OCCURRED ON SYSTEM                      eik
SYSTEM ID                 x0007001B
SYSTYPE                   x00000000

----- UNIT INFORMATION -----

CLASS                         x0022     DEC SIM
SUBSYSTEM                     x0000     DISK
BUS #                         x0000
                              x0008     LUN x0
                                        TARGET x1

This is obviously reporting bad blocks on a disk, which are accessed very often.
My question is: am I right in assuming that the disk with the problem is part
of the raid array re1? (I'd assume that bus 8, lun 0 target 1 whould be the
first disk in the cabinet). Also, is there any definitive way of working out
which RAID controller is in the machine - not being within 1000 miles of it
makes it a bit difficult to ascertain visually and I can't easily get the
machine taken offline for someone to check. Any pointers would be very much
appreciated.

Regards
John