Additionally one of the valves and valve body was rusty, so I cleaned it up with rubbing alcohol and q-tips, and dried it all up before reassembling. Usually it would go on after the first 5-10 miles, so I'm cautiously optimistic about the results.
The board is covered in excess flux now around the solder points, and I may have used too much black RTV gasketmaker to reseal it, and I may have only waited an hour before reassembling and only about two hours before driving the vehicle ignoring the 24-hr cure time, but the truck runs without throwing any codes for the first 40 miles of testing. I *poorly* added flux and resoldered all the big points on the board, some of them looked like they were missing a flake of solder on the tops, so those were probably what was failing. The black gasket that seals the metal around the circuit board had at least four places where it had failed and disintegrated enough that moisture could have gotten in. Update: Have performed surgery on the EBCM.
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