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Does anyone know how to unlock the keypad of a premia 9 alarm. It is locked and displaying '11'. I want to change the battery but not being able to punch in the code because it is locked is giving me a problem. I have no manual for it and it played up after an extended power cut. Any ideas...

My burglar alarm keypad is locked and displaying 11. It is now non responsive when I try to type in a code. We had a power cut for an extended period and I suspect the back-up battery is run down. It has not been changed for about 10 years. The trouble is I am frightened to change it because not...