Vintage Heathkit GC-1107 Series 06009 Digital Alarm Clock Please Read

Up for sale I have a vintage Heathkit digital alarm clock. Clock comes as shown, time works great. Alarm does not seem to go off when set. It could be because there appears to be an issue with the switch on the back left of the clock. Something is rattling around inside the clock which likely relates to the switch. I have not taken apart the clock to diagnose and do not intend to. Great project for someone to tinker with, and a cool retro way to keep the time.
Thanks for looking!