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300.9D control valve spring deformed - no parts availability

300.9D mini excavator creeps when being operated.  The left track control valve has a weak, deformed spring - (for no apparent reason that I can see).  There is no parts breakdown for the control valve (373-9745, $979.96), not even a part number for the orings.  I called tech service for Milton CAT and he said he "can't believe" there was no parts breakdown for the valve.  He suggested we could buy the whole control valve for $979.  His only other suggestion was to for us to ask our sales representative to put in a "Technical Communication" to Caterpillar.

Does anyone have any suggestions on how to obtain a valve spring?  Is the maker of the valve body known?