Security & Alarm Systems Job - Solridge, GP, 2060

Our alarm system works however is very sensitive and alarms during the night without cause. We also have a camera and an entrance system/handsets connected to various parts of the house and cottage. Screens work in 2 rooms. NO VOICE audible and the entrance bell ringer only sounds intermittently in the cottage, not at all at front door. There are 4 handsets (none can hear gate person's voice;) Only 2 of the 3 screens work. We need someone who is not going to rip out our system or wiring recently done but is an excellent diagnostician and repairer.