Intertherm Furnace Experts out there??

Hello, my best friend is selling his house and called me. Old Intertherm furnace cycling burner multiple times. Burner ignites then drops out. Inducer running and pressure switch made. I work on commercial equipment not much exposure to these units. No manual. No schematic. Acts as though not sensing flame. I see no flame sensor. I assume flame is sensed through the ignitor. Cant find any info on Nordyne site m/n G2RC-120A20. I leaning towards pulling burner and cleaning/inspecting. Not sure correct way to check flame signal on this unit. Propane furnace. Any help is appreciated….thanks all!
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