Replacement procedure for suspect drive in ReadyNAS Pro BE

I am still looking for a solution to return the device back to 6 active drives (X-RAID2).

WD Lifeguard Diagnostic shows two good replacement drives: one drive with 57K hours and one new drive.
Both pass WD Lifeguard Diagnostic tests, both have zeros written to all blocks, both show good SMART data.

However, for both drives, ReadyNAS Frontview status indicates "Newly added disk has failed SMART test" when inserting into bay 1 (as noted in previous posts). The "failed SMARTtest" message doesn't show up in system.log.

Old drive:

Raw Read Error Rate         0
Spin Up Time             1133
Start Stop Count           29
Reallocated Sector Count    0
Seek Error Rate             0
Power On Hours          57150
Spin Retry Count            0
Calibration Retry Count     0
Power Cycle Count          27
Power-Off Retract Count    10
Load Cycle Count           29
Temperature Celsius        43
Reallocated Event Count     0
Current Pending Sector      0
Offline Uncorrectable       0
UDMA CRC Error Count        0
Multi Zone Error Rate       0
ATA Error Count             0

New drive:

Raw Read Error Rate         0
Spin Up Time             1200
Start Stop Count            8
Reallocated Sector Count    0
Seek Error Rate             0
Power On Hours            140
Spin Retry Count            0
Calibration Retry Count     0
Power Cycle Count           6
Power-Off Retract Count     5
Load Cycle Count            8
Temperature Celsius        33
Reallocated Event Count     0
Current Pending Sector      0
Offline Uncorrectable       0
UDMA CRC Error Count        0
Multi Zone Error Rate       0
ATA Error Count             0

Thanks, gregb