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Is it just 6,7,8 or is 5 not working too? If 5 doesn't work, I'd check your SEROUT to make sure relayB is in the correct place as all four of the above relays get their information from this same byte.
If 5 is working, try setting relayX_fwd=1 immediately before the SEROUT to make sure none of the possibilities Lloyd mentioned are occuring.
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