Welcome to the forum
I replaced the locks on my BT 5291 bays right after I bought it. I got them at the locksmith and they are all the same key. The original keys are universal and just about every service place has one. I had a service guy ask me for the key and I asked him what for. Seems he was "looking for the water shut-off" mine is in the coach in the closet......makes me wonder just how honest these guys are....scary.
He didn't get the key
Enjoy your travels.