Update:
We finally got around to working on this, due to the nice, sunny weather and mild temps.
When this started, the heater would turn on, and you could smell propane, and hear the igniter trying to come on, but no flame.
We totally removed it as recommended, and I checked the orafice. Totally crudded up with a bunch of ****. Blew it out clean, reassembled it.
Turned it on, nothing. Not even powering on. I then checked for good 12 VDC from the battery, but on the switch to the board, nothing.
Is it possible that during the disassembly, that the board just gave up the ghost, or do any of you know of something more simple to check?
FYI - no blown fuses, and there are no fuses on the board.