printing garbage from FrameMaker file

[Judy Keene]

Help! 

Some FrameMaker files look good but print a single line of garbage
letters per page (for reams of paper) to a Xerox printer but are OK
printing to the HP printer. I suspect that some of my FM crashes and
recovered files might have embedded something in those files but I do
not know how to repair them.  Please advise - thank you!! Judy