Oven not heating

My 88 year old mother told me they had called a repairman to check there oven, he told here the gas valve needed to be replaced. Part was going to be $ 300.00 and labor another $100. I went to your web site used the troubleshooting guide ordered the $65 part you suggested, used your installation guide and had the oven working in 30 minutes. The repair man was going to rip off the senior citzens for about $300. I will use you site and recommend it to others.