Why is my nespresso espresso watery?

I have a DeLonghi Type EN 125S Ser No 81626 S300075 Nespresso machine. the espesso comes out watery, little crema. my wife has run descaler, and cleaned it up. i read that it may be the gasket. I can't find if there should be a gasket that sits on top of the espresso pod when the chamber is closed (handle closed with pod in side). I read that there is another gasket, and youtube findings, that sits below the plastic pod holder that seals the high pressure water when the handle is closed and the spring compressed so this seal is a high/low pressure boundary. I bought a gasket, but it seems to big, not the 31.5 mm ID that it seems the other one are. (1) should there be a gasket that sits on top of the capsule (2) if so, where can I order replacement (3) provide help on the "other" gasket under the pod plastic chamber, if that could be the problem, and where to buy. Thanks for the help!