Has anyone troubleshooted the flush valve on a Perkin Elmer Flexar 200 or similar LC?

My peaks disappeared mid run. I tracked the problem to the Perkin Elmer Flexar 200 autosampler. Between injections, there are bubbles in the rinse line that just go back and forth between the syringe and the solvent rinse container. A video is on http://youtu.be/Qr1wfjp34zc .

Also, the software to manually direct control the autoinjector and valve will not communicate with the autosampler. I need this control to position the valve for removal.

Any advice will be greatly appreciated.