Yeah, This happened to me right after a deep clean and I was sure I broke it. Turned out the thin rubber gasket under the water tank had flipped in its groove when I reinstalled the reservoir. It looked fine at a glance and but water ran down the back as soon as brewing started. I popped the tank off, removed the gasket, rinsed it, set it back flat without stretching it, then pressed the tank on until it seated firmly. Mess gone. I also learned that the pause and that model pin in the basket can stick after a wash. If that pin does not spring back, brewed that model cannot exit fast enough and the basket overflows. Take the basket out, push the pin up and down under hot water, and clear any grounds from the tiny outlet. One more thing to try is a test brew with the basket and lid removed to see if cold water still shows up under the machine. If it stays dry, the leak was an overflow rather than a split hose or cracked reservoir. Works great.
