LG Gas Dryer NO heat, replaced everything! What next?

Model: LG DLGX2651W

Hi Have spent hours reading and trying solutions to my dryer no heat issues... and I FEEL like I have replaced the major parts for this issue.
I have replaced all (3) thermostats: (2) on gas blower, (1) on vent, the thermistor, the control board, the ignitor, the flame sensor and the gas valve.
my dryer will run but no heat. I will write below a few clues to see if this helps at all.
We don't see the ignitor glowing (although its hard to see this)

1. At first I was getting very light heating (gas wasn't staying on long enough) and clothes were very wet and I often got flow sense warning, so I opened dryer cleaned out every inch of lint (unbelievable how much these dryers allow to pass through!) I was assuming restrictions were causing the gas to shut off and show flow sense warnings...
a lot of burnt lint on the gas area.. however NOTE, in my aggressive cleaning I broke the gas coil ignitor., so when I reassembled, and I got no heat, I assumed that was the reason. (also note NO clogs or restrictions in the house venting)
2. I replaced ignitor, as well as all the thermostats and thermistor (just to be sure)
3. reassembled whole dryer (sans top) pressed start to see if we had results. and YES we had good strong high heat! YAY.. Stopped dyer, put on the top, screwed in place. Pressed start.. ZERO heat!!! WTH
4. opened dryer, made sure nohting was loose, I then ran all diagnostics and tests in the manuals, every test checked out fine. I ORDERED a new control board just in case, since I read these can short out? gas valve and flame sensor.
5. replaced all the above. still NO heat. NO ignitor glowing.

few little extras: I read somewhere there are some sensors on the motor? anyone know about that?
AM I missing something? a reset somewhere that was tripped? thanks you.. ready to throw this OUT... I will be so mad if its a $25 part... I have the schematics I can post if that helps.