Product review (5 stars): Works like a charm.
Dryers are relatively simple machines, no need to have a technician come out when you have Google, Youtube, and a really extensive parts selection on Amazon.  Usually one of the two elements goes out first - when that happens it takes longer to dry and the "sensor" settings (more dry/less dry) quit working but the timed dry keeps working.  After the second element burns out there will be no heat.

Was a piece of cake to replace - most difficult part is stretching the coils correctly, I used a 2X4 with a couple of nails on the end and marked to the correct length.  Even if you overdo it, you can somewhat recompress to get the length right. Whole job took me about 90 minutes.

While you are inside the dryer replace the belt and check the drum glides, that's about $15 worth of parts that usually wear out after a few years and it's simple to replace them while you have the drum off.

All told, instead of a $300 technician visit I rehabbed my dryer for 90 minutes of time, $40 in parts, and $5 worth of beer to congratulate myself after I finished.