Thank you to everyone for the interesting discussion! The issues with maintenance for both automated and counterweight systems is topic for another discussion, but suffice to say we've seen some scary situations with both. We've provided the "service required" indicators, and very rarely have they resulted in a phone call. As I mentioned in our "manual backup" discussion, we find people running automated sets with line-contactors all too frequently. There's a fine line between "idiot-proofing" a system and locking them out (and thus motivating them to find a way around it; operating the equipment even more dangerously).