JOHNBRAY11

My factory alarm will go off with in 30 secs of taking key out of ignition. I have changed all door lock actuators except the drivers side rear door. It sticks sometimes but no matter what alarm goes off everytime. Do you think I should repalce the door actuator or just take to Lexus and pay the ridiculous money to trouble shoot it? Lexus asked if all had been replaced and told them all but one and they really didnt offer any suggestions. What do you think? I have 99 RX300. Thanks for any help

John