Any Storage systems or anything?
Most likely cause is a stuck lock actuator. This will not allow the lock knob to move up or down. The actuator is riveted to the door, and is basically a solenoid. It is about 6 inches long and about 2 inches around, and has a black rubber insulator over it. Or did when new. And it will have a 2 wire connector plugged into the bottom of it. Try to move the rod that comes out of it upward with some visegrips. If it won't move up or down, that is your problem. Cut the rod with some good sized wire cutters, and open the door. When you replace the actuator, the new rod comes with it and is part of it. Hope this helps
just get an IR camera record to disk, or buy one of those Game camera that will take a gizillion pic to memory, They come cammo, have an IR lighting device/camera for night.
The flare connection uses pressure to keep the seal. Pipe dope can defeat that by providing a soft barrier in between the metal thus allowing a greater chance for a leak, not to mention it can clog the orifice. Did you know that flex lines are a 1(one) time use item? If disconnected for any reason after the initial install it must be replaced Read the tag that is attached to it.
A lot of us plumbers (including me) put just a little on the threads to make disassemble easier in the future. Some have different ideas about putting dope on the farrells or face of the fitting, but most of us do put a little on the threads. . .