As suggested here, I've replaced the 8 10D2 diodes with 4 BYW56.
The 10D2 is 1A, 200Vr (peak revers voltage), BYW56 is 2A, 1000Vr.
It seems to work but I measure +- 36.2V, was +35V and -32V, should be +-35V. Is the difference of 1.2V something to worry about or is it OK?
I don't know why but...