Intermittent Position Lost and Serious Exception Errors

This Field Change Order (FCO) document, TU81E-F001, provides instructions to resolve intermittent position lost or serious exception errors in TU81+ tape drives occurring during backup operations. The issue is linked to a failure to write or retry tape marks, identified by specific status event codes (11 or 12) or write tape mark check errors. The solution requires replacing the Buffer TMSCP module (29-25797-00) from Revision D01 or below with Revision E01. The document includes detailed installation and testing procedures.