I agree with toyzilla, somebody on your floor knows how to get into your speed control. Do your trucks have the optional display with buttons to the left? Or do you guys use handsets to diagnose the trucks? Had the same issue here on both the 7FBCU30 and 8HBE30 units. The riders can be locked out using the service tool, but the sitdowns cannot. Im sure Toyota will offer some type of dual locking passcode on their sitdowns real soon.