I have an C180 (2002)owned from new. Last night I discovered the passenger side door mirror would not respond to the up and down movement from switch. Drivers side ok and power reaching passenger side ok as can fold mirror in and move mirror from side to side, however trying to move mirror up and down impossible. The mirror has not been hit or damaged in any way. I would appreciate if any member can point me in the right direction in where to start in locating and repairing fault. There is no memory mode for mirrors on this model. Would rather try and fix this myself . Any advice would be gratefully recieved. Thanks in advance.