I’m interested to hear from the knowledgeable- I’ve been told that documented warning of hazards can be spun to hold you liable in the event of incident, since you were aware of the hazard and didn’t mitigate it yourself. Yes it’s a heads they win, tails you lose scenario, but it’s happened once that I know of, and I’m interested to hear from educated parties as to the liability of sending that certified letter. Before hearing of the situation I’m referencing, I would’ve been gung-ho for that suggestion.