vt central locking problems

[98vtberinla]

hi my vt berlina the central locking 2 of the doors work perfectly but other 2 work sometime or not at all not sure where to start any ideas????

 

[VYHDT]

check actuators.. if they are stuck the car wont lock them, it will try then give up

 

[98vtberinla]

yea thats what it does i cane hear it but the lock doesnt pop up or pop down is there any i can do with the actuauors i dunno wd40???