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The most common causes for color drift that I've seen on Ursas and
MkIIIs (haven't worked on Golds) have been temperature and line voltage
variations. You might want to consider borrowing a chart recorder to check
temp/humidity (usually a dual unit) and/or line voltage. Alternatively, you
might have a drifty internal power supply.
BTW, have you been able to monitor the Gold to isolate what's
drifting? Does it show up on test signal or just a film image? Does one
color vary or all?