My brava m6 started to leak, I went to look and apparently it's the tank. I noticed that a rubber came out of the tank lid, it looks like it's the sealing
Amazon.com - iRobot Braava Jet M6 (6110) Ultimate Robot Mop- Wi-Fi Connected, Precision Jet Spray, Smart Mapping, Works with Alexa, Ideal for Multiple Rooms, Recharges and Resumes, White -