It's a 3x6, spanning 3m, fitted into sockets in the brickwork. It's not currently bouncy or anything, but it does suport the side of the bath. Replacing it would be a PITA but if I'm going to have to, I need to do it soon, as I'm currently working on the room beneath and it supports the (L&P) ceiling.
The wood is 'spongy' for the top 30/40mm just before it goes into the socket. I'm thinking that when it's had a chance to dry I may be able to hack out the soft bit, treat the remainder with wood hardener then let a bit of fresh timber in to restore the dmensions (to level it for floorboards and stop if rising in the socket).
Does this sound like an adequate repair or is there a better way to deal with it? Any sensible advice would be appreciated.