curious problem on my WPC driver board TAF

maddog14

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My right magnet does not work. It appears (using logic probe) I am getting hi output from line 12 at the chip at U3. But the tip 102 reads low when it should read hi. The other magnets tip 102's read hi and work. I replaced the tip 102 and the 2n5401. No change.
Yes I swapped connector with other magnets and vice versa. The magnet works. Just not the output to tripper magnet.

The output chain from the chip to the connector appears complete, unbroken and unshorted.

any thoughts or ideas?
 
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