Whirlpool Duet- slightly damp on timed dry/auto dry shuts off, clothes still wet

O[SIZE=3]ur Whirlpool Duet (GEW9200LW1) is about 6 years old.
~ Timed Dry leaves damp areas here and there on clothes no matter how long the dry cycle is set for.
~ The Auto Dry shuts down and leaves cloths very damp.

We have:
~ Checked the temp in the vent pipe- it was 140*
~ Replaced the thermistor[/SIZE][SIZE=2](It was replaced under the 1 year warranty when the clothes were not drying right. That was my guess this time so ordered it for my husband to install. That was not the problem because it is still not drying.)
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Any suggestions would be appreciated.

Carisa