If it has to do with safety of the actors, then it is indeed your responsibility, not to do the actual work, although it will get someone's attention if you start doing it. Here at the Opera, I insisted it be in the contractual language of both IA and AGMA that the PSM can delay rehearsal or performance until any technical, scenic or lighting problem that could cause injury to a performer is fixed. I only use this when ALL else fails. Verbal communication of your concern directly to the TD or Master Carpenter is always a better step than mass distribution through notes... then, you have the position of "I have asked to have the wobbly steps fixed but to no avail, and we cannot rehearse on them again until fixed" type note in your next report.
Educational theater is a bitch, especially when it comes to faculty TDs who think every actor or stage manager is a fool and a scaredy cat and a pain, but rise above their level and ask nicely and if that doesn't work, go over his/her head to department heads, etc. I have worked with theater depts for years and have never figured out what their particular problem is... territory, laziness, posturing pedanticness, or just plain a-- hole, they come in so many shapes and types and sizes... good luck, and just know we have all faced this same stone wall; you, too, will figure out a way to cope, and then share it with us.