I don't recommend using the Casita
without them. They are electrolytic capacitors and are usually used to filter the DC after it's been converted from the AC. They contain a fluid in them that can dry out and short it out, or if they receive a heavy spike it will also damage them. The main problem is that your refrigerator's control board is powered by DC and if the DC is not filtered it can cause problems. The propane
detector is also powered by DC. The battery
acts like a filter capacitor too, but if they included the capacitors that fell out they are needed for a reason.
I would suggest you first take a picture of the converter. Then buy a roll of masking tape, put the tape on the wires like little flags and label them. Then remove the converter board.
Take the original capacitors to any electronics parts store or TV shop and buy new ones. Then check to see if there's are any electronics schools in your area and ask if they will solder them in for you. You can also take them to any TV shop and they'll put them in for you. It's a 30 second job. The converter is still good, just replace the capacitors.
I would also check the fuses, because if the capacitors caused a short, the fuse should have gone out. There might be a fuse with a larger amperage rating then what it should have. I'll be around if you have any other questions.
Sent from my Nexus using Fiberglass RV