The answer was sent to FixYa by rstelter.
The initial indication of the door problem was a chattering noise when a cleaning cycle was initiated. The cleaning cycle was then aborted and the door remained locked.
Here is the fix.
I restarted the cleaning cycle and when a chatter began I 'jiggled' the door until it opened. I removed the door lock mechanism (4 screws and two connectors) and found that the motor driven cam actuator cycle stopped in the locked position, a high point on the cam. I could not rotate the mechanism because of motor gearing, so I used a drill to remove the rivet heads from the motor mount, which also opens the motor.
The top half of the motor contains the motor and a small transfer gear. The bottom half attaches to the cam through gearing. I rotated the cam drive to the full open position and rotated the gearing to match. I reassembled the motor by attaching it with two 1-1/4" x 1/8" screws and lock nuts. After reassembly the oven works as new.
The main cam bearing is a shallow raised section of plastic riding in a hole in the thin steel frame of the mechanism, and the edge of the bearing is rounded. I did not inspect closely, but I believe there is a potential for binding, which may have stalled the motor in the locked position. Jiggling the door while the mechanism chattered may have relieved the binding enough to release the door.
I was quoted $129.00 just to have an Amana technician look at the problem in 'about a week'. I'm sure they would have replaced the latch with a new assembly (another week and another visit).
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