Here is the tech sheet
http://www.servicematters.com/docs/wiring/Tech%20Sheet%20-%203979705.pdf

Would be nice to know what parts they replaced?
Would also be nice to know what they did to troubleshoot this problem re: did they measure the exhaust temperature (Page 6) etc.

[COLOR="Blue"]What we're being told now is that it has a manufacturer's defect and nothing can be done.[/COLOR]
I do not agree that nothing can be done. They have said it is defective but there is no way to fix it, therefore the only real fix is that they refund your money since they sold you a defective product.

I do not know of any common low heat problems with this unit perhaps someone else has knowledge of this.
If the below does nothing then call Whirlpool who I believe actually made this unit re: the 110 prefix. You may have to call Maytag, whirlpool owns Maytag.
I think it is a close match to a Maytag Centennial Dryer.

Try the following
Undo the dryer from the exhaust
Run a load
If the load dries correctly then you have a vent problem.
Clean/check the vent system. Make sure the outside louvers open fully.

If you do not want lint in the house.
Take a pair of pantyhose, put one leg into the other and attach this to the dryer exhaust.
Leave enough room behind the dryer so it can blow out like a windsock.
Run a load.

Both the above will allow you to check the air flow and temp.
Also the above is NOT recommended for a gas dryer due to possible carbon monoxide problems