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Duke, actually you said "The buzzer is in a sealed housing " and a sealed housing can usually still be cut open. Encapsulated is indeed another matter.
"but without breaking open the AWAA module there really isn't a way for me to tell." There is a way to check, use a DMM or ohmmeter to test the circuit. If the diodes are all functioning, the circuit will show near zero resistance one way, and near infinite resistance with the opposite polarity.
If the resistance is the same (near zero) both ways, you have a shorted diode. You should also be able to test across each diode lead to the other two, which will tell you which one has failed--if it is a diode failure.
If it is a diode failure, a dremel tool can solve the encapsulation problem if you really want to repair them.