Error: Movement of needle into seat failed [EE 4714, 3204]

I have a G4226A autosampler with a recurring error message.  Movement of needle into seat failed  [EE 4714, 3204]  

This error started after the autosampler had been repaired by a field engineer.  The main board had to be replaced; the computer was unable to communicate with the LC-QQQ system..  Before that repair, the system had been unused for over a month.  

The error can happen on the first injection of a sample set, or after half a dozen injections, or it can run overnight with no problem.  The needle and needle seat are both new.  I had replaced the old needle and needle seat a few days before the mainboard failure.  What is a good fix for this error?

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