Customer called in about gas leak coming from supply line to the stove. Verified gas leak coming from reducer fitting on supply line. Noticed gasline goes from 3/4” to 1/2” back to 3/4”. Gas line threads has plumbers Teflon tape instead of pipe dope. Also where gas leak was detected, the gas appliance line was not properly installed to gas shut off valve. It was missing sealant causing gas leak. Gave options to customer and customer chose to just have the supply line replaced. Went ahead and installed new gas appliance connector to stove. Checked for gas leaks and no leaks detected.