It is best practice to save configuration to XML as per document hicks mentioned.
This is the latest oracle document regarding :
Saving Domain Configurations -
Oracle(R) VM Server for SPARC 3.4 Administration Guide
Put this in in crontab, and save your configuration on external system, best on some NFS.
SP is on a chip, which you pull out for your old motherboard and plugin in new
Remove the Service Processor - SPARC T4-1 Server HTML Document Collection.
If you have other sparc servers on which virtual machines lived and those were on FC / ISCSI you can use other server LDOM configuration to import to serviced machine.
Do not import primary configuration from another server, just LDOM if on external storage.
Is there anything in
/var/opt/SUNWldm on the machine ?
Also, a good practice which i endorse (if you use putty) is to save all your putty sessions to a file automatically (with timestamps for log files)
To reconstruct what you did or find data inside those log files can be gold sometimes, since we all make mistakes.
Hope that helps
Regards
Peasant.