Peugeot 306 '96 Problem - Sporadic alarm triggered central locking failure

Hey all,

I have a really odd problem. My alarm triggers a central lock on
priming through a fob. This worked since the original installation in
1995. During the last few weeks, I've had problems with this - alarm
triggered central locking works perfectly every time - the unlocking,
however, does not!

This alarm triggered central unlocking failure lasted for a week,
resumed working on its own for a few weeks, stopped working for a day,
resumed working for a few weeks and now stopped working again - a few
days ago. Odd, indeed.

Triggering central locking and unlocking - by using the passenger side
lock (either from the inside or from the outside) works perfectly.

It is of interest to note that the drive side lock does not trigger
central locking or unlocking, but is locked/unlocked when the passenger
side door is locked/unlocked (that is - it does not affect the central
locking but is affected by it). I resealed the inner door membrane a
few weeks ago (opened the door AFTER the problem started, so this is
not a cause) and noticed 2 wires not connected to anything inside the
door - this probably is related.

When I use the fob to trigger the alarm I hear a tick from the driver
side door. I don't hear anything in the passenger side door. Not sure
whether this has always been like this...

Any help would be appreciated!

Thank you.