My wife was smelling gas around our gas oven/range combo, so I purchased some leak detection bubbles and a cheap gas sniffer. I soap tested everything visible around the flex line and this is what I found at the fitting between the gas line and regulator:
Turns out the person who installed the range didn't teflon tape between the regulator and the fitting, so I taped the joint and tightened everything back up. I did a second soap test and everything checked out.
But! The gas sniffer still detects gas around the oven, only when the gas is turned on. It doesn't detect gas anywhere else, even around other gas appliances in the house. I spoke with an appliance repair tech., who indicated there wasn't much he would do other than what I had already done. He suggested using a lighter to see if gas was getting to any of the burners and that he didn't think it was very likely that the regulator could be malfunctioning. He said if me or my wife keeps smelling gas, or if I detect gas at the burners when the oven is off, that he could make a service call but that he's very busy.
At this point I am wondering if the gas sniffer is just too unreliable and/or sensitive, and that the gas to the appliance is now safe. Every professional I've spoken with says they've found gas detectors to be unreliable, even with the more expensive devices.