Has anyone carried out repair instruction TJ20698 (https://www.tsbsearch.com/Volvo/TJ-20698) for fixing possible water in the bulkhead? I'm thinking this may be the source of the sloshing sound 'in' the dash. I had planned on doing it over the weekend but then the weather and work prevented it. It looks fairly straight forward but it'd be good to hear of other people's experiences before I start drilling into the car.
Thanks