1986 300 SDL is the car. It did this a while ago and just healed on it's own so I forgot about it, but now the problem is back and permanent. I have searched the forum and found a lot about this but still can't open the sucker. I can't find the "magic" cable under the seat. The key works the trunk lock fine and unlocks the rest of the car as well. It's that other lock off to the left of the main one that does not release. Some say it's part of the alarm. My alarm is disconnected and the trunk still worked after I did that so I don't think so. I have tried all combinations of unlocking and locking from all the doors etc. Assuming I get it open how can I make it so I never have this issue again?? Thanks.

-Alex