Kenmore dryer (70 series) drying ever so slowly

[texcarole]

Our oldie but goodie Kenmore 70 series dryer, model # 110.76784100 which has been drying perfectly, suddenly took semi-forever to dry a load.  I had started on low heat, then switched to high and EVENTUALLY it did dry the load.  

These dryers are really work horse, last a LONG time with the occasional part replacement.  What part might be causing this?  When we have had the heating element go out in the past there was no heat, not just very low heat.  Heat sensors?  Thermostat??  Worth repairing??  

Thanks!
Carole the (partially) Irish washerwoman

Model 110.76784100

[JWWebster]

Hello my partially Irish washer woman friend, If the element was bad then you would have NO HEAT at all so we gotta suspect either one of 3 thangs. The control, the timer, or the lint. It is my experience we do not replace too many control thermostats so we are down to lint and timer. If the lint is clear from the filter housing blower wheel and vent pipe then you has got to look towards the timer. I gotta tell ya though 99% of the time the timer ain't the problem. So if none of the above was the problem, what the heck could it be then? It could be a bad breaker! They get hot and quit on ya causing symptoms like you mentioned.

[texcarole]

Excellent reply, JW.  I think you are right on the money with the lint theory.  But glad to know that if that fails, the breaker is a possibility.
I shall relay this to the electrical engineer husband aka the poor soul who is going to get stuck doing this!  This really helps and glad to know we can quickly order parts here.  What a great web site and a super service you guys do!

Thanks tons and sure and begorrah 
Partially Irish Washerwoman Carole 

[Repair-man]

If he's an engineer, we'll have to dumb it down for him a bit

 Have him take his voltmeter and inspect the voltage at the place where the dryer cord attaches. If you lost a leg of power, the dryer will still run, just not heat.