I cannot find any info on the given model number.
Are you sure it has the "C" in it.

Just to ensure that the vent is OK try the following.
Unplug the unit and disconnect it from the vent system.
Now try a run.
If it now dries OK odds are the vent system needs checking.
Be sure to check that the louvers on the outside of the house open correctly.

If you do not want any lint in the house.
Take a pair of pantyhose.
Put one leg into the other and then attach this to the dryer's vent.
Leave enough room so the pantyhose can balloon out like a windsock.

Both the above will let you check the temperature and the air flow.

I doubt it is the hi-limit thermostat as that is just a safety device and should not open during normal operation.

Did you clean/check the blower wheel?

You could check the exhaust temperature on a high heat setting should be up around 135 degrees F.