The accumulator issue was what closed it before (when it was closed on Passholder Day).
The issue currently is to do with the launch system itself, and as far as we know right now, is currently waiting for a part to arrive so they can fit it. As well as that they'd also need time to test it thoroughly and make sure everything is ready for operation again.
I'd imagine it'd be back open within the next 2 weeks, if not the end of the month. They may have it ready for May half term but your guess is as good as mine currently.
Hope this helps