If the sound has feedback tomorrow, put it on the report. If it has feedback the next day, on the report again. Sooner or later they'll get the hint.
I re-read the original post and found a few things.
Monitoring 14 mics especially of the wireless variety is not what I call easy.
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Changing 15 cables, (meaning one got replaced twice).
Strike 1
Noticeable feedback in a rehearsed show.
Strike 2
uldLate sound effects happen, because playback devices(cheap or old ones especially) are prone to mess up when least convenient.
Depending on the frequency and reason this could be a strike or not.
ClearCom broken- what kind of sound tech can't use a soldering iron?
Sounds like an excuse not to communicate.
Strike 3
Being rude and disrespectful.
Strike 4
If they can be replaced it needs to be done.