Dear Arnit ,
Please do not send attachments or case updates to tac@cisco.com.
If you need help from tac team, could you please specify your issue?
If the issue is about RMA part, please contact apac-lsc@cisco.com.
You may email any attachments or updates to attach@cisco.com. Use your service request number as the subject of your email. You can also update your case using Support Case Manager at: https://tools.cisco.com/ServiceRequestTool/scm/mgmt/case
Would you like the ease of opening and managing your support cases on your smartphone or tablet? You can do this and more with the Cisco Technical Support mobile app for IOS, Android and BlackBerry devices. For more information, go to: http://tools.cisco.com/squish/BA511
Thank you for contacting Cisco
Vera Ma
Cisco Technical Support