The flip down tv in our 420 started making some clunking noises as it got close to being shut and after shutting. When we try to activate it to close, it seems like the motor to drive it up starts but doesnt engage the tv to close. After a few seconds it engages and goes up but then clunks at the end. Has anyone had a similar experience before? Does anyone know how the flip down tv activates itself - maybe like a pinion gear off a motor? Any ideas or thoughts on what might be wrong and how to access the drive mechanism? Thanks for your input.