We should have some real Spondoolies-approved spare PSUs next week to make this kind of thing unnecessary.
WARNING: There are some serious issues with the I2C interface in most Emerson PSUs.
In my experience those problems are intentionally caused by the firmware, which reads "OEM ID" field through the I2C bus. While I don't recall the details anymore, those are somewhat easily fixable by reflashing the PSU "OEM ID" or changing the firmware. The details probably still can be found on Internet when searching for the information about Sun Microsystems server hardware and how to break out of the Oracle (and others) service contracts on hardware while maintaining software service contracts.
In this case it may be easier to pressure Spondoolies into releasing the unlocked firmware.