IMPORTANT: Any time you install or remove components, disconnect power to the unit before you begin. "Hot Plugging" components in this manner can cause even further damage to one or more cabinet components.
Check that the top connectors where the timing mechanism plugs into that the pins are straight and free of corrosion.
Check for loose or corroded field wires at the screw in connectors.
If there are no signs of damage or corrosion, swap the terminal board with a known operational terminal board. If the problem goes away, send in the original terminal board for reconditioning. Create a UPS Shipping Label HERE.
If the issue still exists, swap the timing mechanism with a known operational timing mechanism. If the problem goes away, send in the original timing mechanism for reconditioning. Create a UPS Shipping Label HERE.