I have a 2126 that need a new actuator for the cassette that tells the printer paper is full or empty. It is physically broken. It looks very difficult to get to. Looking at the manual pictures, doesn't really help. But it almost looks like it can be accessed from the top if laser is removed. Am I off base on this ? Anyone changed this part without ripping machine apart ? ( the white plastic one that seems to have 2 actuators and plugs into the cassette pwb ). Looks almost impossible.