Thank you for the responses.  We think that we may have had a condensation collecting on the retort lid.  Air flow/room temperature.  Sakura is being very helpful.

Marilyn Gamble
Quality Assurance Coordinator, Cellular Pathology 
Regional Reference Laboratory, Sherman Way 
(818) 503-7029, tieline 397 
E-mail:  Marilyn.S.Gamble@kp.org