I had the same problem on my 75 A/S. Called around and like your model there is no new fix. I called around for a few days and then finally I found a local lock guy that knew how to replace the worn part that was needed. Works great and I didnt have to cut up my door to install the updated system available. Also not to long ago, maybe two weeks, there was a door lock like yours on the for-sale items. might look into seeing if they still have it on line.