I run into similar situations all the tme, and I'm probably a fool in that I rarely charge for them.
The first thing you need to do is determine exactly what is happening. Almost always, there is something wrong that needs fixing. A "bad" breaker is by far the exception.
Once I find out what is really broke, it's a matter of deciding who gets to fix it. If it was something that might have been my doing, I fix it right away, for free. If not, I explain to the customer what is really wrong, and who should fix it.
Sometimes this leads to a chat with another trade. In those cases, I explain how I eliminated "electrical" from the possible cause. That oftem points them in the direction of the real problem.
The most important thing is to enter the situation with an open mind, and discover what is really happening.
FWIW, the last "bad breaker" call I got was eventually traced to a bad receptacle.
