Probably the elements, but first check that you have 240 volts to them.
Obviously if you do, and they are not heating, they are bad. I doubt new
elements are terribly expensive, and replacing them can be a DIY
project. Dunno about your machine, but I worked on a GE dryer that was a
lot older than yours. The elements were behind the drum so the drum had
to be pulled out to get to them. This particular one was a major PITA
because the w&d were in a little storeroom with NO room to work,(I swear
i looked like the room was built around the machines), and it was during
the middle of summer in S.Tx. If your machine is in a place where there
is ample room to work, it shouldn't be that hard. I don't think there is
anything really tricky about the job. Go for it--worse case, you screw
it up and have to buy a new one anyway. Larry