Cat 330L Diagnosing Hydraulic Gremlins. No power to left forward track

This is an older Cat 330L escavator. The left forward track is not responding. The unit was made in Japan, has zero CAT E.T. compatibility, and the customer has gone through multiple mechanics attempting to pinpoint the problem. After a few days of diagnostics with the dash control, and finally busting out a whole lot of hydraulic gauges and whip lines, I was able to isolate the gremlin to what is referred to as a Negative Flow Control Relief Valve. The part works as a spring loaded shock absorber and pressure relief circuit. It's berried deep in the Main Control Valve Block. Essentially a 300ish pound, aluminum manifold with around 2 million hydraulic lines coming out of it.
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