Maytag Neptune gas dryer won't stay lit

Hello,

We have a 10 year old Neptune dryer that's having heat issues. First problem ever so hopefully it's easy to fix.

Here's what happens: The dryer will run but the flame won't stay lit. With the front cover off the igniter lights, the flame ignites and stays on for about 10-15 seconds, then it goes off. It will cycle occasionally as well. With the cover on and the door shut, the dryer just isn't heating much at all. It will run for hours trying to dry a load of laundry and the air coming out isn't very warm.

Here's what I've already done:

1) Complete disassembly and clean out all vents, ducts, etc. Airflow through the dryer is very good. I also scrubbed off the sensor portion of the thermostats too.
2) Continuity test on the high limit thermostat over the flame: 0 ohms
3) Continuity test on the cycling thermostat on the duct: 0 ohms. Tried it on the stove burner and it shut off then back on as expected as it heated up.
4) Continuity test on the thermal fuse: 0 ohms
5) Continuity test on the flame sensor: 0 ohms
6) There's another sensor on the duct that I'm not sure of... registers as shut; I jumpered it and the dryer wouldn't start at all so I'm assuming that's correct.
7) I don't think it's the moisture sensor as it has the same behavior for both timed and sensor dry. Also on sensor dry the timer will edge up to 99 minutes as the dryer realizes that it isn't drying quickly.

The only thing I haven't tested is the circuit board and the gas solenoids, but I'm not sure how to test those. I don't want to drop $300 on a new board until I'm sure that's what it is.

Given the symptoms, do you think it's the solenoids? If not, any advice on testing?

Thanks,
-scott