I recently purchased a LR 2003 Disco II SE from a used car dealer. Has anyone had any problems with any of the locks, mainly front passenger doorlock not opening. I tried using the remote on the key and all the locks open except the passenger front door. The alarm system may be triggering this. I guess I will have to take back for check-up. I read manual but there was no reference to this type of problem. Any assistance is appreciated.