As usual, Old-Biscuit has nailed it.
However, you did say the fridge "works great" on AC so you apparently do not have a coolant leak, especially if you have removed the fridge and can inspect the burner area. That leaves the control board, circuits/ignitor, and gas burner orifice to check.
Your fridge may still be functional on both AC and gas, but at this stage, with the unit already removed and it being 26 years old, going with a new fridge may be a wise move.
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Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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