I assume that CCA stands for Conformally Coated Assembly. If so what
chemical family did the coating
fall into (acrylic, urethane, etc...)

*Usually, CCA stands for circuit card assembly, a synonym of printed wiring
assembly.

How long was this device "in the field" and how much exposure did it
receive to humidity above 80%?

*I seriously doubt this information would be recorded or known.  Most units
don't come with build in humidity loggers.

BTW those "faint carbon tracks" are usually all that left when the dendrite
vaporizes due to current
flow.

*Sometimes.  They can also be residual tin and lead of the dendrite
themselves.

Doug Pauls
Rockwell Collins

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