So I plugged in the substitute RX receiver and one of the TZ85As is working properly. The other one is working but I think requires reflashing, which I can do tomorrow.
Amazingly, the original RX is still working.
UPDATE: So feeling a bit "double or quits" at the moment, I replaced one of the TZ85A speed controllers with the FeatherTwo controller, made sure all the polarities were set correctly and plugged it in. Amazingly, it works and failsafes OK. If I can resurrect the borked TZ85A, then we are back in business.




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