Have you had problems with the class approval, appeal and grievance process at TESU?

[Merlin]

a 400-level Biochemistry Course at the University of California San Diego Extension.

The details are not important, what is telling, I think, is the process, which was fraught with dishonesty, and I believe that I am not alone in this experience.
[...]
I think we can collectively force the issue to be addressed.

There are usually ways to remedy these kinds of situations in a way that is much more likely to gain results. There is an escalation process. If your advisor doesn't approve your request, and you have grounds for appeal, you can appeal through the evaluations team (which is where it sounds like you ended up). If that doesn't work out, you can escalate to the dean of the college within TESU that your degree applies to. If that doesn't work or you don't feel it is impartial, you can appeal from there up to TESU's president. If that doesn't work then I suspect you may be out of luck. Appealing to the accrediting board will not do anything. From there you may be better off just changing schools.

Not to mention, even if you have a legit grievance, TESU is known for being one of the most flexible institutions when it comes to accepting credits. As long as the school is RA and the course doesn't duplicate something else on your transcript, you should get credit. It may not always apply the way you think it should (i.e., it isn't guaranteed to meet a degree requirement for a specific course), but you will get credit for it.

How a transfer course is evaluated is usually dependent on a comparison of learning outcomes/syllabus of the external course vs a TESU course to determine where to slot it at TESU. If TESU doesn't offer a comparable course, it may get slotted as an X99 course.

I don't know on what basis you're making your impartiality claim, but you must also keep in mind that the advisory team's job to help you select courses within TESU, they are not well informed about transfer credits or even how that process works in many cases.

As for the dishonesty/misleading stuff. I don't believe the advisors intend to be dishonest but they are known for being wrong... a lot. I think it is generally a lack of communication within the TESU advisory organization. When the advisors don't know the answer to a question (which happens a lot with transfer credit), or don't know for sure, it often seems like they will just make an educated guess or assumption rather than running down the answer and confirming it internally. But in many cases those guesses are wrong.

So yeah, they definitely need to fix the communications problems and improve their customer service and response speeds, but those are outside the realm of the accreditation body's purview. My guess is the team is probably short-handed due to tight budgets and are putting in minimal effort to try to get as many things done as possible.

In any case, I think you should try to get the dean of your school (and/or the president of the university) on the phone first to air your issues. That is the most likely way to get a result. Trying to get them in trouble with their accreditation board is unlikely to provide the results you're looking for. Particularly given that schools aren't required to accept transfer credits at all.