Steve,
I would concur with Steve Creswick, either a molding compound misalignment
or an adhesive of some sort.

As to the exposed copper:  dunno.  The potential for corrosion is higher,
depending on what ionics they left behind under the film, and how permeable
the film is to moisture and pollutant gasses.  Will the assembly be
conformally coated for service?  If so, with what?

Doug Pauls
Rockwell Collins

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