Central locking issues

Looking for help with my central locking. Fob locks and unlocks the rears and tailgate, however the drivers door doesn't lock or unlock, I have to use the key. Also the front passenger door won't lock or unlock, I have to push the knob down to lock and pull the handle from inside to unlock. Interior lock/unlock buttons do the same as the key fob. Just need to know what I have to look at and where they are located.

As per the interior light thread found loose relays in the ccm, resoldered them and seems to have fixed it for now. Only worry is why they fell out, might be a faulty pcb so may need to buy a replacement.

Must have spoken too soon! Went out earlier, dash warning to say hatch open, wasn't shutting at all, I unlocked the car with two presses on the fob. Locked the car on the fob, all fine. Opened on the fob with button pressed twice, all open and hatch won't shut and hold. Lock again and one press of the fob to open and okay. Now if I unlock from inside all doors unlock and hatch stays shut. Guess one of the relays is failing somewhere, very odd! The joys of an 18 year old car!