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Thank you for your response. I have rectores everything and system works fine. However, it is, as you point out , it is ,20 years+ old and is likely obsolete. My wife is insisting on a new alarm system (something like wireless Ring)!

Hi. Although not showing any faults, I recently replaced the standby battery in my intruder alarm and noticed that some scorching has ocurred in one of the resistors. See photo. Is this repairable? Is it symptomatic of other faults? Should I replace? For now, I have removed all fuses and...