“IIRC, the code for no trouble found, was NNB. The higher ups never wanted to see that in the reports.”
I’d sit with the techs sometimes as they troubleshot and I’d watch what they put down. If they tested it and it worked they’d just randomly select a code. I’d ask why and they’d say, “We were told not to use the no-trouble-found code.”
It was a valuable experience in how life really worked. The guy who regularly came up with new codes had not only never troubleshot anything, he’d never even worked on the equipment. He lived in his own little idyllic universe, much like liberals.
LOL. Reminds me of "pencil whipping" PMI's (Preliminary Maintenance Instructions) like shut a perfectly operating radar down at 4 in the morning to vacuum dust off of some vacuum tubes. Then hope it comes back up OK. You can risk a lot of hassle, or just sign it off.