Hello Tech's, we have a few Lexmark CX921 MFP's, one of them is causing a problem Error code 200.91 (The paper remains detected in the printer after the printer is turned on). According to Lexmark service manual we checked, all sensors are working (Toggle method) next replaced Image controller board, then Expansion Board then Engine board even pushed a new firmware, Cleared NV ram but the error remains. Any suggestions would be highly appreciated.