galaxy 2

Hi, I have a faulty contact sensor, it keeps throwing RF fault. After some diagnosis I think the sensor is faulty. So I order a replacement. The sensor is for the main door. I don't know much about alarm systems but I am good at following clear instructions. I have the engineer code. Please...

Security company say my keypad needs replacing (after a Tamper 0 error). They want to charge £200 to replace. I think I can buy a new keypad for £30 on Ebay. Is it a simple process of swapping the keypad on the current backplane (checking the wall tamper) or am I being too naive?!