Just like the Sun test equipment slogan for decades- - - - -"We Test- - - -Not Guess!" Everything is wrong until you prove it's right. Shotgunning parts at a problem is not a solution and usually creates more trouble by exponentially increasing the tendency to induce more errors. Back in the dark ages we called guys like that "wheelbarrow mechanics"- - - - -roll a wheelbarrow full of new parts up to the job and start swapping stuff until something fixed the problem. Of course, they never removed any of those parts- - - - -"It probably need it anyway!" Any new hire that tried that in my shop didn't last until lunch on his first day on the job.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!