Russia is turning the gas tap a little closer again, “due to a technical defect”: is that correct? And what is the impact?

In recent days, several European countries have seen their supplies of Russian gas dwindle sharply. In turn, the European gas price has risen sharply. A consequence of Russia turning the gas tap of the Nord Stream pipeline a little closer again. According to Gazprom, this is due to a technical problem surrounding a German part of the pipeline. But is that really so? And what are the consequences for Germany and the rest of Europe?