What about the switch that tell the MPU to make the scoop fire? Does it open/close in diagnostics?

You may have a perfectly good coil chain, but a brain-dead switch to tell it to do so.

Ahh I missed the in test part. Yeah then if the flasher and the coil on the a/b side both fail then its power/driver related and not the switch.

Where as you already figured out the driver is good, you are probably looking at a prediver or the chip. You can logic probe it. Do a stare and compare with the next closest driver.

The 7408 is probably just bad. There are ways to test them with a logic probe or a meter, but you are probably just wasting time by trying to dig deeper until you replace it. (Be sure to install a socket and verify all etch continuity to the socket before you install a chip for sanity sake)