Power RAID10 array reconstruct fails ?

Hello,

P7 machine
PCI Express x8 Planar 3Gb SAS Adapter

RAID10 array(2 disks)(not AIX lvm) was configured and working, then one disk failed and IBM support replaced that. Now raid array is degraded, data is not lost. I see new disk model(same as original) serial and etc.

What I did trying to reconstruct:
Booted diagnostics, launched RAID Array Manager, lets list array status:

->List SAS Disk Array Configuration
------------------------------------------------------------------------
Name      Resource  State       Description              Size
------------------------------------------------------------------------
sissas0   FFFFFFFF  Available   PCI Express x8 Planar 3Gb SAS Adapter

hdisk0    00FF0000  Degraded    RAID 10 Array          283.8GB Rebuild Failed 04
 pdisk1   00030000  Active      Array Member           283.8GB
 pdisk0   00020000  Failed      Array Member           300.0GB

so array is degraded, pdisk0 is new replaced disk(same model as original) - it's size looks bigger but disks not formatted as raid block size look bigger?, I tried to format it using "Create an Array Candidate pdisk and Format to RAID block size" but no items available for operation since pdisk0 is already pdisk not hdisk.
So lets try to reconstruct:

->Reconstruct a SAS Disk Array->select "pdisk0    00020000  Failed      Array Member           300.0GB"
Post processing pdisk0........Rebuild 0% |
  
                                ERROR MESSAGE                               
                                                                            
   Press Enter or Cancel to return to the                                   
   application.                                                             
                                                                            
     1800-034 Exit status (255) returned by command.                        
     (Command process used the stdout and stderr                            
     file descriptors inherited from the SMIT process.)                     
                                                                            
   F1=Help                 F2=Refresh              F3=Cancel                
   Esc+8=Image             Esc+0=Exit              Enter=Do                 
  

Any ideas how to recontruct / what is wrong ?

Thanks,
Vilius M.