The new eco friendly solder is LEAD FREE and the early use of this caused a phenomena called "tin wiskers' where the tin in the solder would actually grow wiskers which according to Murphy's law go to the closet point to cause a short circuit. Do so repair work and this stuff is miserable to work with. OP sorry, i have never worked on any Apple equipment.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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