bad hbridge eh?
well thats one of those things that happens
the logic misinterprets the fault and throws a code that has nothing to do with the actual fault.
The H-bridge board supplys voltages to circuits and one of those may have been to the circuit you had lost causing the code 60.
Troubleshooting guides are just that, guides, they lead you in the direction most likely to fail, but if you find no problem there then you have to dig deeper and back probe till you do find it.
This is where wiring diagrams come in handy.

glad you found it though