We have a prostar 410 autosampler that is not working correctly. THe carriage moves but the needle does not, at all, past vial 7. I have turned it off and on again and restarted the run but it stops when it gets to the vial spot #8 and won't go past that. There are no error codes that show up so that doesn't really help in diagnosing. Is there a service manual for the autosampler where I might be able to further investigate?