I have come across a couple of homes with damage from HVAC condensation. Would this be considered an HVAC defect to be remedied by the HVAC contractor? All attic spaces were properly insulated and no other signs of water intrusion were noted.
If you go that route, you should make sure that you know the cause and do not just suspect the HVAC system, because you have not identified the root cause as something else. Otherwise, identify the issue and recommend further diagnostic evaluation to determine specific root cause and appropriate remedy.