There are 2 fuses on the main PC board, one 12V, one 120V. Do you have 120VAC at the receptacle where the frig is plugged in? It is on a breaker in the main panel.
If the pressure-test (manomometer- water column) did not detect a gas leak, go rent a combustible gas "sniffer", trace every line, then check every gas appliance's regulator. BryantRV.com
has downloadable owners,installation, and service manuals for most RV appliances.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"