I'm not an EHA guru, but was looking into your issue more for learning purposes. I used "20ma" and "KOEO" as search criteria.

In many of the posts that came up using these 2 values, I repeatedly saw mention of the EHA current measurement being taken with the O2 sensor disconnected. You might want to do some reading on this.

I saw 20ma with KOEO as being pretty much std. in most cases. I believe there are some model(s) that run 10ma KOEO, but most are 20ma KOEO.

If the O2 sensor should be disconnected, this might explain the 75ma reading you're experiencing.

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