Update
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Wednesday 29 November 2017 at 03:16
Reflowed the solder joints (they did not look that great). Followed the 3 wires up to and then re-seated the pins/connector J120.
Success! The error is cleared and the diverter functions as expected.
I'll close the ticket.
Thanks for the help, Lloyd.
Source: http://pinside.com/pinball/forum/topic/afmr-diverter-gate-stuck-closed#post-4097148