I believe that particular ZZSE is an early model, and those had a heap of problems if I remember correctly.
I had this similar problem recently and found a tutorial over at BitPimps forum.
I had to install a new steering motor, but that's a worse case scenario.
You might just have to 'reset' it, which can be achieved through the ZZSE steering tutorial I mentioned above.
Might take a steady hand and some patience, but dig up a tutorial and open that ZZSE up!
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