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If the solder connections are all valid, then I do suspect the optocoupler now.  I was hoping it wasn’t, but I couldn’t be sure until we eliminated the other possibilities.

Now, I’m also concerned that the high voltages you measured may indicate that the current flowing through the optocoupler LED may be too high.  Although the spec sheet says it should be OK, I hope you have voltage at the cathode that indicates that the LED did not blow.