when the heat is not on (just on tumble dry, no heat) it runs the full 70 minutes with no problems.
when the heat is on, it trips at almost exactly 10 minutes. resetting the breaker allows it to run for 10 minutes more...ad infinitum.
i suspect the heating element, but i'm not entirely sure. they're expensive for this model (about %25 of the cost of a new dryer), so i want to be sure before i buy a new one.