>>12618997The only thing I can think of is maybe it fell out of an appliance or a tv or something. Have you recently moved any large items that maybe aren't working right anymore?
To get it open, I'd take an exacto knife and cut along the line, pressing straight down so that the blade goes next to the pcb edge rather than into it, completely removing the meat of the tab. Only do the two tabs on one side, and you should be able to hinge the pcb out like a door.
