We are looking for some help with a processing anomaly which surfaced 
     ~ six months ago. We began to see laminate voids in our epoxy boards. 
     Polyimide does not seem to be affected. We have verified lamination 
     cycles, investigated layer clean, oxide thickness and pre-clean. 
     Solutions seem to remain random. We are running low on ideas. 
     
     Has anyone out there experienced the same problems? Solutions? Riston 
     residues? Conversion coatings?
     
     Thank you in advance to any help you can offer.