tr5339

This issue is only occurring in a single bay of the material station. When a role of ultimaker white PLA is empty, instead of switching to the new white PLA roll sitting in the bay next to it, the printer will throw a "ER65 - Flow sensor error" when the drive gear runs out of filament to push into the print core. Is this due to an encoder within the singular bay being dirty? If so, how should we go about cleaning the material bay. Thank you.