Ano po ride nyo? New unit under warranty or not? Kasi kung warranty pa yan pwede mong ibalik sa pinagbilhan.

Kung hindi na, maluwag lang yung shaft sa loob na kinakapitan ng master control. Kelangan buksan ang sidings para higpitan. I'm sure gumagana pa yung master control nyan since you pointed out that other door locks still activate except for the driver side lock.

Merong available na alarms wherein you can opt for unlocking the driver side door only or unlocking all doors in one press. Afaik, wala pang nilalabas na option for selective unlocking/locking any doors. Just forgot the brand while typing... it will cost more than your ordinary alarm.