Question about Lenovo Legion T7 RTX 4080

hello ^^ I can't find any data on the SSD installed in the Legio T7 RTX 4080 I-9 13900KF. It says storage factor: PCI Express. At first glance I thought they meant a PCIe slot SSD. But that can hardly be the case with a high-end. I would also like to know which clock frequency, TBW or manufacturer etc. is used. Motherboard specifications are just as sparse, even on the website. To somewhat assess the upgrade possibilities. What shape are the FAN connectors, is it flashable, how trashy is it, what additional PCIe slots does the board have etc.? It would be super nice if someone could give me some quick info, or even just a source! My friend just had part of his PC scraped off and the offer is only remotely profitable right now. Thanks in advance!