While you have the TCI out, if and only if you're good at soldering, you can resolder every joint on the other side of the board to head off a problem where some of the joints microscopically degrade from vibration and become intermittent. You can do it through the coating. Those four diodes in the upper right, in the two TCIs I've had apart they are a fragile white bulb shaped thing made of hollow glass. Yours look better. The way the conformal coating is they look original.