Did your wireless door contact fall off ? Replacing a door ?
If you are a do-it your-selfer and want to avoid a service call from the alarm company then why not remove and replace the wirless door sensor yourself?
Other types of wireless alarm sensors could also be removed and replaced in a similar fashion.
The step by step process can be found on my website by clicking here.
Or just go straight to my Honeywell™ Lynx Plus alarm training Training Page that also offers other Tutorials.