Hi Hitesh,
Cloning is not the recommended way of building a new server, but it should work logically.
I suspect in your TST environment BO servers (services) are still referencing the your old PRD environment. Have you removed the old server references in your TST environment and created a fresh SIA with associated servers in TST.
Refer the blog below for removing old server entries.
BusinessObjects Content recovery and Disaster recovery - BO XI 3.x
Regards,
Mani