How does your company make a living dealing with such dry-joint
problems by sucking or wicking every joint before resoldering?

It doesn't. I'm an individual who's been repairing electronic equipment, on
and off, for almost 50 years.

I learned a long time ago that there are two ways to repair something --
find out exactly what's wrong, or do whatever's needed to get the damn thing
working again. Neither is the "best" approach -- it depends on the problem.

In this case, it looks as if there's a bad solder joint -- or perhaps a
cracked trace. It's less trouble to systematically resolder the joints than
try to find the "bad" one. Note that two recent posters to this group have
had good luck doing basically that.

The problem with just adding a bit of fresh solder is that there's no
guarantee you're really getting the solder into its "liquidus" state. It's
better to remove the solder altogether, so you can see what you're doing. If
you have a SoldaPult, or a similar tool, it's not much trouble to quickly
remove the solder from a dozen or so joints.