I cooled the fridge down on 110v for 30 minutes, then I tried lighting it
on gas.

It's hard to light, but it does light.  I can't see a flame in the window
and the LED panel light doesn't light up.  But, I can hear it burning from
inside the camper from the sound that comes out of the flue, a low rumble.

It stays lit as long as I hold down button B, the safety valve by-pass.
When I release the button, it immediately goes out.  Do I have a bad
safety valve?  The service manual troubleshooting has "faulty safety valve
magnet" and "no contact between thermocouple and safety valve" items as
possible causes for when it won't stay lit.

--
==Leonard