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How can I fix my Fisher and Paykel E331T?

How can I fix my Fisher and Paykel E331T, it has a defrost problem-it is not defrosting and the alarm is beeping.
By the way I am a refrigeration mechanic.

Thank you in advance.
George, April 2010
Count the beeps when in alarm. Number of beeps is the error code which will give some idea of what is wrong.

Lincoln Appliance NZ, April 2010