Your PET came with a 3-year Warranty. 
After 3 years, it is advisable to purchase an annual warranty for the cost of $1 a Day
$365 per year.
PET electronics are molded in epoxy to achieve high sonic performance, and thus, when faulty, their hardware can not be repaired. Only its embedded software can be reprogrammed.
This is why it is advisable to extend the warranty.