Explanations please

I rather doubt that sewage treatment involves a lot of high technology. So why can no-one explain what has gone wrong at Seafield? The most detailed explanation I have been able to find is in this BBC report:

Helen Lennox, Scottish Water's head of corporate affairs, apologised to customers for the inconvenience caused.
She said: "This was a catastrophic failure at a pumping station and we have been working around the clock to fix it.
"On investigation our engineers found the repair was a much larger operation than first anticipated and we have had to locate specialist pumps from other parts of the UK".
The Scottish Environment Protection Agency has already said emergency measures to "minimize the risk of pollution" were being put in place and has warned the public not to come into contact with the water.
The failure affected just one of the flows going into the treatment works and that Seafield continued to treat the rest of its intake as normal.
John Rae, the General Manager of Customer Operations for Scottish Water, explained the sewage flow would have to be diverted before higher capacity pumps could be installed.
"The line that's coming in where we have the problem is only about a quarter of the total flow that Thames actually treat. Now in saying that, it's still a huge flow that's actually coming in - so they have to be able to divert that fully to stop the emergency overflow from running."

This does not leave me much wiser about what precisely has gone wrong and what will be needed to fix it.

Oh and don't bother checking the websites of either Scottish Water or Thames Water. They may be in the business of providing emergency services but they obviously do not believe in updating their websites over the weekend.