There appears to be a couple of sequencers: White Rodgers 24A15-5. The ends of the wires going to the bottom sequencer are corroded and a little fried and it appears some of the wires are not original.
Is it possible to replace this sequencer with a universal type? The specs are: spst, 1 switch, on 35, off 30 and normally open.
One additional question: I think I blew a fuse while switching to fan mode while trying to diagnose. The fuse is a 'fustat 4.5A type S'. The problem is that when I look into the fuse socket I see the numeral 5 and also a 3-1/2 and am not sure what fuse to use to replace. I have not been able to find a 4.5, but a 5.0A can be ordered.
Thanks for the suggestion about the sequencer.