Are you sure it is a bad spring? Most of the time it is the plasic link above the spring that attatches to the hinge. It is # XXXXX in the look up below. You will need to unsecure the unit to pull it out about 6 inches. Most of the time under a good install nothing else will have to be removed. Unplug the unit and turn off the water to it just in case.
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Thank you let me know if it was the spring or the links, please...
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Use the manual above to help. Remove power from the unit. Open the door and remove the mounting screws. Remove the toe panel and lower the legs so the top of the unit clears the counter top. If the water supply is copper you may want to remove the valve from the unit but leave the copper on it. This is so not to cause a leak. If you remove the toe panel you may be able to find the spring and the peices of the link. Let me know..