When the dishwasher first went out, I called a repairman. He said it was the vent assembly and that it would cost us almost $400 for the repair. I told him that I could buy a new dishwasher for that, and he said that the replacement part was expensive and difficult to install. I paid him his $50 fee and sent him on his way.
After checking AppliancePartsPros.com, I bought the part ($112 at the time of purchase) and decided to do it myself. The installation was so easy. I'm not exaggerating when I say that I simply unscrewed and unplugged the old part and plugged the new one in.