I have a Xerox 550 with Production Finisher and Square Trimmer. Everything works but the output tray is missing from the Square Trimmer. (I've been unable to find one used, but that's another story.) After printing and stitching 9 booklets -- that I just let fall into a box on the floor -- the machine stops with the error: "The Right Bottom Tray (Booklet Maker) is full. Remove output from the tray. Or, press the C button to cancel this job." If I cancel the job and restart the machine (turn off/on) the fault is cleared and the machine will print another 9 copies. Is there a workaround to solve this?