A CUSTOMER IN (B)(6) REPORTED THEIR THINPREP 5000 PROCESSOR WITH AUTOLOADER ETCHED A WRONG VIAL ID ONTO A SLIDE. THE ERROR WAS CAUGHT BY THE CUSTOMER AT THE TIME AND NO PATIENTS WERE AFFECTED. HOLOGIC'S FIELD SERVICE ENGINEER (FSE) WAS UNABLE TO CONFIRM THE ERROR. THIS IS CONSIDERED A REPORTABLE EVENT SINCE THE THINPREP 5000 PROCESSOR DID NOT PERFORM AS INTENDED.