Hi, The mech. you have pictured is the latch mechanism and the correct part you need to move (the white plastic part). There are only two receivers used in the 928 -- but there are also two latch mechs used. One, is with alarm -- one is without. If you have the one with alarm you may have a harder time with the latch mechanism -- but it can still be done in the same way as previously described. One of the problems you may be encountering is the lid release spring that's located within the receiver (the part mounted into the body is the receiver). This spring puts pressure on the latch mech. and pops the lid up when the latch is released. Try having someone hold down on the lid while you operate the release rod. The release rod is attched to a metal actuator, that may be where you are getting hung up when you try and slide something up to the latch mech. This actuator is held in the receiver by a roll pin. I'm not sure if it can be removed while the receiver is still in the vehicle. (Am not at the shop and that's where cars and parts are). I will try and post a few pictures of the receiver and latch mech. if I can find them to give you a better idea of how they work. The latch mech. with alarm is a little different than the one you have pictured, but still operates and releases the same way. Although, it is possible that the lock cylinder is jammed inside the latch mech. and is not allowing the white plastic latch portion to release, but I've never seen that happen. You seem to have a pretty good understanding of how it works, here is a link to receiver. Good Luck, John How do you post images?
http://www.mailordercentral.com/928intl/prodinfo.asp?number=928%20512%20055%2020