Most alarms monitor the dome light for intrusion purposes. The VX will also make that long tone if you try to arm it with one or more doors not completely shut which then tells the dome light to dim and go out as the alarm is set. I’d make the place that installed the screen put back that expensive dome light either behind or infront of your new screen and the problem should go away. Or does the new screen have it’s own dome light? If so, it is just wired incorrectly and they still need to be the ones to fix it.