I tried to reply a bit earlier, but our internet here was down after some local storms.
Earlier this evening, we got brave and ran a normal load through on Cold/Cold. All worked perfectly well until we got to the last bit. 8 minutes left on the final spin cycle, the machine started spraying water into the basket during the spin. The open valve never stopped spraying water during the spin. Eventually the sloshing of the tub pulled water up through the air vent and out the back again.
I powered down the machine to prevent a further mess (and one more cleanup with rags and towels). The water continued flowing into the tub from what I could hear even with all power off. I closed the main water valve in the garage, and that did finally stop the flow. Was able to turn machine back on and start a Rinse and Spin cycle selection to clear all water from the tub (I did turn the main water back on a minute or so after Rinse cycle had started).
Since then, we've attempted another Speed Wash cycle and again had the same problem listed above with water coming out of the air vent no matter water temp selections. At that point, I am able to power down machine then start a Rinse and Spin cycle to clear the tub. At this point, I'm a bit afraid to let the load go without watching it (lol). Oddly enough, this "sloshed water out the air vent" problem has not occurred a single time during the Rinse and Spin cycles - even with a full tub of water when this starts.
So interested to hear what your thoughts are, and as before thank you for the input and ideas.