Hi Chris
I have a 560 together with 4 gas version 831, it was in daily use until we got FSA 740 some years back.Have just switched it on, FSA fine but coming up with a fault code on the gas analyser-which should be repairable,
We had always used Steve Bicknell from ADE for calibration of this unit, I am sure he could sort it.

£500+vat to a good home.

Ed Kaps
01642 617626