i had my yale hsa6400 premium alarm for a year now and all works ok,except for the power plug that powers the control panel.after a short time the plug gets RED HOT and smells like its overheating/burning,also the case has gone yellow from the heat.should the plug get this hot i am worried about it starting a fire.its always been hot,could i have a faulty one and can i buy the plug seperate ?how much do they cost.oh and as soon as i unplug the power the yellow light comes on next to the triangle symbol?