Since no one else has any input... My limited experience with this and your description of the problems suggests one of the transformers is acting up. A lot of power conditioners and transformers will go bad over time.
Is the hum new? Could something that you've got plugged into the transformer be kicking up noise like a laptop power supply or display? Try unplugging everything from the transformer and adding things in one by one to see if you have a noise maker in the bunch. If possible, try hooking the transformer up to another circuit in the studio if you have one. Do you have some gear powered through the xformer and some hooked directly up to the wall? If so, you may have yourself a ground issue. That might be difficult to address, but balanced cables could help. Give those things a stab and post back! Good luck
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