Why is it that every thing has to be re-named as time passes this was called a cracked solder joint or cold solder joint in my time.
Cold solder joints are caused by inadequate cooling to the board over a long period of time.

If you believe dry joint then your choice is simple using a heat gun you need to re-flow the controller.

OR

Visually check the controller for dry joint shown below, then re-solder the connections that need to have solder re-flow.

dry joint .jpg

My boss the other day wanted me to check his soldering jokingly knowing he wanted me to re-flow the connections I told him they looked fine to me.
I could barely contain myself when seeing what the soldering connections looked like none of which would have passed my QC soldering inspection.
He did not agree with my joking assessment an asked to make it look better he stated we are a business and need to strive for perfection.