greetings from Mexico
I had a similar problem in alarm 123 of the VF3
check element by element until you find the fault
I found it in the subfuente commutated that gives high voltage
change the integrated circuit TOP247YN and the CR5 diode
analyzing this subfuente commutated is the one that causes you
failure in the regeneration and the dc buss
I hope this information will serve future problems
it was an odyssey with good results machine


regards