Hog II Midi Problems

I have worked on many Hog 2 consoles and just found one w/ a midi issue. I am not getting any signal from any midi port and have oppened to check all connections, trace lines, resistors etc. but nothing seems to be wrong. The one technote from flying pig states a resistor in the circuit thats not supposed to be there but it was already removed.

Does anyone know anything I am saying??
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