Brother color won't feed paper

I have the CLp 300 color laser from Brother. It stops feeding paper even when there is nothing stuck in it. I have tried the following to solve it. I open all doors, front and back, run my hand through and do a visual inspection. I turn it off for minutes or hours. I lift the whole printer a quarter inch and put it back down, just to see if there is something that needs to be jiggled. The printer then cycles through feed for two seconds and stops. Nothing moves and the red light comes on and stays on. I am thinking there must be a sensor somewhere that is out of adjustment. Of course Brother tech support have not been able to help. Thanks for any ideas.