That was the one thing I would note on electrical issues was connections do degrade over time. I used to periodically check temps on panels and plugs with a handheld infared thermometer.
Of special note should be any aluminum wiring. Not too uncommon in ballast and driver wiring.
I feel like there is a lot more than can be added to this thread.
Elsewhere here, there has been mention of using an N95 when applying diatomaceous earth.
Careful when applying nutes, lest you splash your buds. Don’t care to smoke that.
The chemicals and the nutes should probably require gloves and safety goggles, same with any of the pesticides and definitely need adequate ventilation. Don’t rush. don’t spill.
@Loggershands good start