There may also be an issue with the charging station. My Roomba does not return to the charging station. When placed there manually, Roomba does not charge. Unplugging the charging station and charging Roomba directly works. I then reconnected the charging station to power and measured the voltage across the spring terminals. No DC voltage could be measured. I unplugged the charging station and cleaned the terminals with a Q-Tip and rubbing alcohol. No change in the measured results across the terminals. Question: How do I dismantle the charging base? I managed to unsnap all but one centre retainer. Has anyone serviced the charging base? Thanks in advance.