Receive error code F01. Cleaned all sensors but unable to test them as my ohm reader decided not to work today. Dryer will run perfectly during the first heat cycle. On subsequent heat cycles the pilot comes on but the gas valve does not appear to open and therefore not light for more heat. Could this be a bad sensor, control board or gas valve? Thanks for any help that can be provided to narrow this down.

First, look at this: https://dl.dropboxusercontent.com/u/8010163/Whirlpool_Duet%20Job%20Aid.pdf
All driers will fail in some way that when the lint builds up like concrete on the inside of the air ducts, once you run it once it has overheated and that is probably why you get that error code. You need to totally tear it down and scrape out and wash all of the parts except the motor, which you vacuum out. Halfway doing it will not work. This includes the exhaust vent, all the way, even the outlet on the side of the house, if you have one. If a safety blows, you will also have to find the blown safety with an ohm meter. You cannot guess and just change parts. You can go to YouTube to see videos on how to take it apart, but do a very good job or it will fail again quickly. I would get a new belt and change it while you have it apart and get some white lithium grease and grease any bearings you find. Obviously, you need to grease the bearings, if they are not already scored and ruined. I think your dryer has a center drum bearing and support rollers which all need greasing. You need to pull the support rollers apart to grease the pins with white lithium grease. All sensors work together by comparing temperature, so all need to be cleaned. You just unplug the wires from the sensors and remove ductwork that they are attached on and clean the entire thing with soap and water. Make sure you go all through the dryer and get all parts like the blower fan and housing, vacuum out motor well and clean exhaust. Mark all wires you unplug so you know where they go. This is an easier job than you would think. You need a meter to test any fuses that may be blown. You will see them on the schematic diagram.
See: Dryer vent cleaning prevents fires - YouTube (http://www.youtube.com/watch?v=A6wmD502-xE) and: Cleaning out a dryer with top lint cleanout - YouTube (http://www.youtube.com/watch?v=OBNDbyRm68M&feature=fvsr)
Cleaning out a dryer: By a woman 2 of 2 - YouTube (http://www.youtube.com/watch?v=a73HTFkcB90&feature=relmfu)