This delayed the fan repair too.

Our lavatory had a slight drip before our trip, upon return I rotated the seal a touch in the hope it may reseal decently, naturally quite the reverse happened and a new seal was needed rather urgently but our local hardware stocks them.
The seal is already fitted here and the yellow arrow points to its location, the old worn seal is shown on the right of picture.
It's the sort of job where you feel like washing your hands afterwards.