Well, to start you can just use an ohmmeter to check across them, a shorted one will read either zero or a very low resistance. If you check all four, and the problem channel is markedly different, I'd simply replace the TVS. As a simple test before you have the part in hand, you can just remove the problem one. The TIU will operate fine, it just won't have the transient protection afforded by the TVS.
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