What's wrong with the Bakerloo line?

What's wrong with the Bakerloo line? No timeframe for fixing 'operational incident' causing days-long delays, says TfL - TfL ...
ianVisits

Bakerloo line train upgrade moves forward as TfL seeks land for larger depots

Transport for London (TfL) is preparing for a new fleet of Bakerloo line trains by expanding the depots needed to house them.