Mexico leaded solder as bad as PbF?

Fender Hot Rod PR 246 probably 2005 from IC datecodes , "Made in Mexico" . Something in excess of 20 bad solder joints. Indentation and 'cool' soldering iron tests and lack of crystalline haze with admixture of leaded solder indicates it is leaded solder. But appearance is more conical than spherical. Known bad supply of conventional solder there and then , contaminated , eg greasy, component leads ?

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N_Cook
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