SL500 drive error

More than one month ago, a drive in SL500 did not work normally. The following errors appeared in the /var/adm/messages:
Feb 27 08:21:00 ******** bptm[17486]: [ID 507448 daemon.warning] TapeAlert Code: 0x27, Type: Warning, Flag: DIAGNOSTICS REQ., from drive IBM.ULTRIUM-TD3.002 (index 2), Media Id 000097
We replaced the drive, the bezel, the SFP, even the fiber in the drive. And also downgrade the firmware version. But error still existed.
Then we exchanged the location of the failed drive and another good drive. Errors still occured on the failed drive. So replaced the drive again and error disappeared.
In the process of exchanged the drive location, the drive path does not corresponding to the tape device one by one.
# luxadm -e port
# luxadm probe
……
Node WWN:500104f0009d2dfe Device Type:Tape device
Logical Path:/dev/rmt/0n
Node WWN:500104f0009d2e01 Device Type:Tape device
Logical Path:/dev/rmt/1n
Logical Path:/dev/rmt/2n
Node WWN:500104f0009d2e0a Device Type:Tape device
Logical Path:/dev/rmt/3n
Node WWN:500104f0009d2e04 Device Type:Tape device
Logical Path:/dev/rmt/4n
Node WWN:500104f0009d2e07 Device Type:Tape device
Logical Path:/dev/rmt/5n
# luxadm display 500104f0009d2e01
DEVICE PROPERTIES for tape: 500104f0009d2e01
Vendor: IBM
Product ID: ULTRIUM-TD3
Revision: 73P5
Serial Num: 9210259391
Device Type: Tape device
Path(s):
/dev/rmt/1n
/devices/pci@8,600000/SUNW,qlc@1/fp@0,0/st@w500104f0009d2e02,0:n
LUN path port WWN: 500104f0009d2e02
Host controller port WWN: 210000e08b1eaf21
Path status: Not Ready
/dev/rmt/2n
/devices/pci@8,600000/SUNW,qlc@1/fp@0,0/st@w500104f0009d2dfc,0:n
LUN path port WWN: 500104f0009d2dfc
Host controller port WWN: 210000e08b1eaf21
Path status: Not Ready
# cfgadm -al
……
c2 fc-fabric connected configured unknown
c2::500104f0009d2e05 tape connected configured unknown
c2::500104f0009d2e08 tape connected configured unknown
c2::500104f0009d2e0b tape connected configured unknown
c3 fc-fabric connected configured unknown
c3::500104f0009d2df2 med-changer connected configured unusable
c3::500104f0009d2dfc tape connected configured unknown
c3::500104f0009d2dff tape connected configured unknown
c3::500104f0009d2e02 tape connected configured unknown
……
# cfgadm -c unconfigure c3
# cfgadm -c configure c3
# luxadm probe
……
Node WWN:500104f0009d2dfe Device Type:Tape device
Logical Path:/dev/rmt/0n
Node WWN:500104f0009d2e01 Device Type:Tape device
Logical Path:/dev/rmt/1n
Node WWN:500104f0009d2dfb Device Type:Tape device
Logical Path:/dev/rmt/2n
Node WWN:500104f0009d2e0a Device Type:Tape device
Logical Path:/dev/rmt/3n
Node WWN:500104f0009d2e04 Device Type:Tape device
Logical Path:/dev/rmt/4n
Node WWN:500104f0009d2e07 Device Type:Tape device
Logical Path:/dev/rmt/5n