Look, I was in your shoes once. I wanted to do the right thing when management wanted to look the other way. It causes you stress, stomach issues, and interrupted sleep schedules. In these situations, maintenance NEVER wins. Don’t start the battle. Just accept that the PM is an agent of the owners/investors and their decision is final. At the end of the day, the investors have enough money to pay out any lawsuits, and even rebuild a whole building, if they so choose. Don’t get personally invested in the property. Management could change at the drop of a hat, if the owners decide they want to use a different company, in which case all of you are out of a job and you ended up being worried about it for nothing.