water in A/C trunk line

last year we noticed water leaking from the trunk line that feed the second floor of our house - we have had this unit for about 10 years with no issues. We thought it was because the pump line was clogged and cleaned that. We put up an uninsulated flexible tubing to see if the water was forming on the outside or inside the pipe. After running it for a few days 2 weeks ago we noticed that there was again water inside the trunk line.

We do not have a problem with water on the floor but do get some condensation of the lines as the A/C is located in our basement.

Any thought before I get an A/C repair here?

 

What exactly are you calling the 'trunk line' and 'pump line'?

 

The trunk/pipe line I am refering to is the flexible tubing that comes off the furnace unit (we have forced hot air) and travels straight up to the second floor to be distributed to various lines/vents the cool the rooms upstairs. All these vents are in the ceiling and we have had our attic lines inspected to see if that was the problem and nothing of cause was found.