It was the solenoid. The customer called back to say it was now jamming. I pulled one off of a 4250 and swapped them out. When comparing the two, the old one was holding a little magnetic charge, causing the lever tho hesitate for a slight moment before snapping back, thus causing the out of time noise. When it stuck for too long, it made the "burp". With the covers on, the noise was funneled to the front, through the paper tray. I had changed them before for failing, but never had one sticky like that. Thanks for the response.
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