Lynette Lopez is a senior correspondent at Business Insider.

And she started hearing rumblings about Tesla years ago.

But at first, she kind of dismissed them.

A lot of my Wall Street sources started getting involved in Tesla around 2014.

And that is when they started talking about how the stock was overvalued.

That story was never particularly interesting to me, because it seemed clear that the stock was

overvalued and that the company never made money. But it didn't seem that any of the shareholders

actually cared about that. And so that, to me, was not a particularly interesting story until

I was contacted by somebody within the company.

It was Sprint. Lynette was at home when she saw an email.

I was contacted by a guy who worked on the manufacturing line at the Gigafactory,

which is Tesla's Nevada plant. It makes all the drive units and batteries.

His name is Martin Trip. He sounded credible, so she called them up.

He basically told me that Tesla wasn't exactly living up to its brand. It was not making sexy cars

that also saved the world, because its manufacturing process was so flawed.

Martin Tells Lynette, the Tesla's factories, may not be as good at making things as many thought.

Then Lynette publishes her findings from internal documents, showing the factories are generating

huge amounts of waste because of flaws in the manufacturing process.

For every car that it made, it would throw away about a third of a car.

Her source alleges that a misprogrammed robot once punctured holes in hundreds of battery packs,

and then the company repaired them and put them back into cars. Tesla denies this.

Sources said the company kept shutting down the production line to fix problems,

...