2009 sunroof drain

[div4scpro]

2009 S60 2.5T
Sunroof drain issue. On two occasions only the driver’s side has flooded, front and back. I have drained water through both front drain tubes. It seems to come out no problem. Can’t drain water
Don’t refer to the procedures to any other year or model, please. In a 2009 S60 the front drain tubes for the sunroof are inside the A pillar, that means inaccessible. The stealership won’t even tell me where the soundtrap, the piece at the lower end of the forward drain tubes are located even though the parts department has a part number for it and said they can order it. I have poured water through the sunroof front drain tubes and watched it trickle it out through seams in the frame about 6in. behind the front wheel well.
Does anyone know how to access this soundtrap, endpoint , of the front sunroof drain tubes?