s relays and latch relays are the main culprits for this kind a problem. Watch the car run up and see if s relays pick in order. Latch relays pick and stay picked in up and drop on the way down. This is a typical ladder circuit and the relay prior the problem floor is usually the problem. PM me with a phone number or a e-mail and I will see what I can send you tomorrow. But a MOD really such a shame to tear out such good stuff. Haaaa