Woody,
OP here. No found resolution to the issue. I'm a bit weary of sending it to MTH given the current state of everything (The pandemic, closing up shop or at least to our knowledge). Your situation is probably the same as mine, and would most likely require a re-flash done by MTH as GRJ posted above. Nice to know I'm not the only one with this issue, but sad to see another locomotive fall susceptible to this issue. Let me know if you're able to figure it out.
Joe