SLL45ssslcktih67laldll.

Translated, this means no one knows what causes it precisely. Going way back
with Boeing, and a nice guy named Phil Tjele (can't remember last name
spelling but rhymes with jelly), he spent considerable time studying the
phenomonon and concluded, as did many others, we don't know what causes it.

What does IPC 600 say aboutit? Look it up please and tell us.

MoonMan

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