My alarm has malfunctioned as workmen took bell box off and twisted all wiring togeather thus blowing fuse in main panel on mother board, they reckoned to fix it it appeared so, but few days later small operating panel started beeping and all lights flashing, only way to stop it was switch power off and then back on but , again few days later the same thing. Now there is nothing, on inspection of mothere board i see a dark part on it , any ideas as to were i can get another.