I'm having a problem with my '84 300SD. When I unlock and open the driver's door, the alarm goes off and continues to sound until it times out. (It has done this occasionally over the past few months, but the problem always went away with a couple of cycles of the key in the lock; now it doesn't). I can start and drive the car, but when I touch the brake pedal the alarm horn starts again, and runs until timeout (unless I touch the brake again). Also, the trunk opening button will not depress (or accept the key) to open it. I suspect a vacuum problem, perhaps (I hope) hoses; or a bad switch or solenoid somewhere in the system. I hope it's not the pump.....

Any ideas?

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rdsw
Salem, NH
1984 300SD, 260k miles and counting