Hi TekFan,
I replaced the diode, the resistor ok, 3,3k. Really, this resistor and diode very primitive voltage regulator solution. There was not 100v Zener at home, so I soldered together three diodes temporary (56 v + 33 v + 12 v). All three diodes are heating little bit, so it may need to add a series-pass transistor. Anyway, tomorrow I will buy a 100v zener.
I checked all the voltage again. It seems everything is ok (48, +15, +15, +5). I think so that each graetz works properly.