So this happened today :-/

[LuSe4]

tap to fix means busted solder joint, open it and fix broke joint

Good to know. Thanks!

 

[yukon2004]

Just tapped on mine... Nothing :-/

 

[LI99HOE]

Seems cold solder joints are a big problem in these GM trucks. 4x4 switch/heater controls/etc.
Resoldering saves the expense of a new part, especially if these components look
aesthetically new still.