I would suggest contacting nuArc. They don't make cameras any more (nobody does) but they should know who is still available to service them.

FWIW, integrator problems on this camera are sometimes due to loose / crudded connections - open up the back and wiggle the small circuit board(s) that plug into the large board(s) and also the wires from the integrator sensor. Ditto the wires from the bulbs to the relays.