Fairline Targa 47 - Water inside the cabin

[Happy Dane]

Dear all
I have a wonderfull example of the super nice Targa 47, but now I ran into a problem with water inside the aft cabin.
The water comes through the ceiling above the beds (spot and speaker holes). When I remove the ceiling plates I can see the underside of the fiberglass construction and there are some water above this construction.
I`m unsure whether it is rain water or “drinking water” as I can`t find a link between rainy weather and the drips. By washing the boat - nothing comes in.
Have any of you experienced something like this or have any ideas to where the problem start?
Are there e.g any water pipes close to this location which might can have a leak?
All ideas are welcome.
Thanks in advance
Kent

 

[KompetentKrew]

Get someone to stand outside with a hose.

 

[Happy Dane]

That I of course already have tried and no water inside

 

[Boater Sam]

Condensation on the underside of the deck. Heat and ventilate.

Insulate under the deck.

 

[Happy Dane]

Thanks - but its not condensation either. I also checked that.
When I remove the ceiling plates I can see it seeps out through the construction.

 

[Dellquay13]

There may be more detailed knowledge of the Targa 37 on the ybw Motorboat forum?