Oh BS! Doctors get paid the big bucks because they are supposed to be smart.
You can't convince me that a powerhead is blown when it isn't.
But I kinda understand, because occasionally I'll have someone bring in a motor and claim that "something just ain't right" and try as I may I can't find a single thing wrong with it. I've found that it works better to do SOMETHING, even though it's totally unrelated to the issue they are claiming, than it is to say "Look dude, I think you're imagining things because I don't see anything wrong and I can't make it do what you're saying it does". Then a week or so later they'll call or stop by and say..... Whatever you did fixed it. 🙄
I totally gave the motors owner a placebo 😅 But I would never say "yep your right, SHE'S BLOWN" and offer them 200.00 for it. 🙄