Certification? What silliness is that?
OK, I suppose, if your very business is based upon selling your opinions to someone who might sue. But for maintenance? Balderdash - you might as well expect the guy to get 'screwdriver certified' with endorsements for Phillips and Torx!
The camera is just another tool. Period. Point it, and the picture shows you hot spots. How hot? There's a scale right on the display. Hot enough to worry? Who knows- but it's your clue to look closer at the area in question.
Then, since YOU are the maintenance guy, you get it fixed. Maybe you even take another look at it with the camera to make sure the problem has gone away.
There's no need to make everything into a Federal case.