It was indeed a points failure that caused platform 1 to be out of use, on a Friday afternoon/evening a couple of weeks ago. It must be a pretty major fault as in the past points failures I've been aware of have been resolved within a few days at most.
That being said, platform 2 has signalling allowing for bi-directional working and the timetable just about allows for it as long as everything is running well. It can fall apart pretty quickly though if not! But if a full replacement is required, then it will need a possession with no trains running into platforms 1 and 2, perhaps even the full station. I'd imagine it would need longer than the 6 hours overnight in the usual timetable, which would therefore need a lot of planning, orchestrating and choreography!