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It may be worth while changing the lytics on your units, especially the dead ones.
The AM series and BAVMz units tend to develop bad lytics with age and some of my regular use units arrived with such bad PS hum that the overmodulation lights were on with the inputs unplugged and the pots at minimum, lytics in other stages can cause other problems in them too.
One thing they love to do especially with bad caps is introduce varying levels of hum (depending on how bad caps are) into the video.
Just a fact of life that lytics over 15 years old are not guaranteed to last beyond that... Especially in rack mount conditions where adequate cooling isn't always present.
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