The first problem you encountered sounds like a bad latch release actuator. For more info see post #3 in this tread http://www.siennachat.com/forum/64-...oor-wont-open-interior-buttons.html#post69653
Are you not able to unlock the door using the inside sliding button? When you press the lock/unlock on your remote does it move the manual lock button on the inside handle on the sliding door?
Are you not able to unlock the door using the inside sliding button? When you press the lock/unlock on your remote does it move the manual lock button on the inside handle on the sliding door?