Turns out the problem in the stove was not with the control board, after all. Landlord came over and we replaced it, but it still cut out. So we started jiggling wires with no result, all the way down to the plug.
Yup… the wiring in the outlet was loose. On a 220v, 50 amp plug. Needless to say, he didn’t bitch about replacing a control board that wasn’t bad.
Dad is healed up and is doing fine, so mom went in for her surgery Thursday; shaving bone spurs off one of her vertebrae to hopefully alleviate the back pain she’s been suffering from for a while. She sounded much more chipper, so hopefully it’s done some good.